style.css

:root {
    /* Day Theme (Default) */
    --bg-color: #f9f7f2;
    --header-bg: rgba(249, 247, 242, 0.8);
    --text-main: #2c2420;
    --text-muted: #4a3f35;
    /* Darker for better contrast */
    --accent-gold: #d4af37;
    --wood-dark: #5d4037;
    --wood-light: #8d6e63;
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
    --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.05);
    --shadow-panel: 0 18px 45px rgba(44, 36, 32, 0.12);
    --input-bg: rgba(255, 255, 255, 0.5);
    --input-border: rgba(0, 0, 0, 0.1);
    --book-bg: #fff;
    --paper-color: #fffdf9;
    --nav-active-color: #3a241c;
    --nav-active-ring: rgba(58, 36, 28, 0.18);
    --surface-panel: rgba(255, 255, 255, 0.72);
    --surface-elevated: rgba(255, 255, 255, 0.92);
    --surface-soft: rgba(255, 255, 255, 0.58);
    --control-border: rgba(93, 64, 55, 0.14);
    --control-focus-ring: rgba(212, 175, 55, 0.24);
    --control-hover: rgba(255, 255, 255, 0.96);
    --radius-panel: 24px;
    --radius-control: 18px;

    /* Vibe Colors */
    --vibe-mystery: #78909c;
    --vibe-romance: #ef9a9a;
    --vibe-classic: #a1887f;

    /* Dimensions */
    --book-width: 160px;
    --book-height: 240px;

    --book-thick: 40px;

    --constellation-book: #facc15;
    --constellation-mood: #8b5cf6;
    --constellation-genre: #10b981;
    --constellation-author: #3b82f6;
    --constellation-shelf: #f97316;

    /* New Brand/UI Variables */
    --border-radius-soft: 12px;
    --shadow-hover: 0 15px 35px rgba(0, 0, 0, 0.15);
}

/* Fix: WCAG AA Contrast Floor - Issue #534 */
.glass-panel,
.book-tooltip,
.book-detail-modal,
[class*="glass"] {
    background: rgba(0, 0, 0, 0.45) !important;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

[data-theme="night"] {
    /* Night Theme (Dark Wood) */
    --bg-color: #1e1a18;
    --header-bg: rgba(30, 26, 24, 0.85);
    --text-main: #e0d5cb;
    --text-muted: #d5c7bc;
    /* Lighter for better contrast on dark */
    --accent-gold: #fccb4e;
    --wood-dark: #3e2723;
    --wood-light: #5d4037;
    --glass-bg: rgba(0, 0, 0, 0.3);
    --glass-border: rgba(255, 255, 255, 0.05);
    --shadow-soft: 0 10px 40px rgba(0, 0, 0, 0.4);
    --shadow-panel: 0 18px 45px rgba(0, 0, 0, 0.45);
    --input-bg: rgba(0, 0, 0, 0.2);
    --input-border: rgba(255, 255, 255, 0.1);
    --book-bg: #2c2420;
    --paper-color: #e0d5cb;
    /* Overrides */
    --shadow-hover: 0 15px 45px rgba(0, 0, 0, 0.5);
    --nav-active-color: #fff2df;
    --nav-active-ring: rgba(255, 242, 223, 0.22);
    --surface-panel: rgba(19, 16, 14, 0.74);
    --surface-elevated: rgba(34, 28, 25, 0.92);
    --surface-soft: rgba(255, 255, 255, 0.06);
    --control-border: rgba(255, 255, 255, 0.1);
    --control-focus-ring: rgba(252, 203, 78, 0.24);
    --control-hover: rgba(255, 255, 255, 0.1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* Smooth core animation and hover transitions for interactive elements */
button,
input,
select,
textarea,
.search-input,
.action-btn,
.suggestion-btn,
.send-btn,
.btn-primary,
.close-modal-btn,
.close-genre-modal,
.genre-card,
.book-rec-item {
    transition:
        background-color 0.25s ease,
        color 0.25s ease,
        border-color 0.25s ease,
        box-shadow 0.25s ease,
        transform 0.25s ease,
        opacity 0.2s ease;
}

html {
    scroll-behavior: smooth;
    transition: background-color 0.4s ease, color 0.4s ease;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: "Georgia", serif;
    /* Classic serif for books */
    overflow-x: hidden;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color 0.4s ease, color 0.4s ease, border-color 0.4s ease, box-shadow 0.4s ease;
}

main {
    flex: 1;
}

/* Explicit night-mode overrides — bulletproof fallback */
[data-theme="night"] body,
html[data-theme="night"],
html[data-theme="night"] body {
    background-color: #1e1a18 !important;
    color: #fff5f5 !important;
}

[data-theme="night"] header {
    background: rgba(30, 26, 24, 0.85) !important;
    backdrop-filter: blur(25px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}

[data-theme="night"] .search-input,
[data-theme="night"] input {
    background: rgba(0, 0, 0, 0.2) !important;
    color: #e0d5cb !important;
    border-color: rgba(255, 255, 255, 0.1) !important;
}


/* Global Wooden Scrollbar Styling */
::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: var(--bg-color);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--wood-dark), var(--wood-light));
    border-radius: 6px;
    border: 2px solid var(--bg-color);
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, var(--wood-light), var(--wood-dark));
    box-shadow: inset 0 0 6px rgba(0, 0, 0, 0.3);
}

h1,
h2,
h3 {
    font-weight: normal;
    font-family: "Playfair Display", serif;
    /* Elegant headings */
}

/* --- Layout --- */
header {
    padding: 1.5rem 4rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--header-bg);
    backdrop-filter: blur(25px);
    -webkit-backdrop-filter: blur(25px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.15);
    /* Subtly deeper bottom border */
    transition: background-color 0.4s ease, color 0.4s ease, backdrop-filter 0.4s ease, border-color 0.4s ease;
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.search-bar {
    position: relative;
    display: flex;
    align-items: center;
}

.search-input {
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-family: "Georgia", serif;
    width: 200px;
    transition: all 0.4s ease;
    outline: none;
    color: var(--text-main);
}

.search-input:hover,
.search-input:focus {
    background: var(--book-bg);
    border-color: rgba(212, 175, 55, 0.35);
}

.search-input:focus {
    width: 300px;
    box-shadow: 0 0 0 4px rgba(212, 175, 55, 0.14);
}

.search-icon {
    position: absolute;
    right: 10px;
    color: var(--text-muted);
    cursor: pointer;
    transition: color 0.3s ease;
}

.search-icon:hover {
    color: var(--text-main);
}

.logo {
    font-size: 1.5rem;
    letter-spacing: 1px;
    color: var(--text-main);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-links {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem 2rem;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-muted);
    transition: color 0.3s ease, border-color 0.3s ease, font-weight 0.3s ease;
    display: inline-block;
    border-bottom: 4px solid transparent;
    padding-bottom: 8px;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text-main);
    font-weight: 800;
    border-bottom-color: var(--accent-gold);
}

/* Hide active underline if another link is hovered */
.nav-links:hover a.active:not(:hover) {
    border-bottom-color: transparent;
    color: var(--text-muted);
    font-weight: normal;
}

/* === ANIMATED HOVER TOOLTIPS FOR NAVIGATION (NEW) === */
.tooltip {
    position: relative;
    display: inline-block;
}

.tooltip-text {
    display: none;
}

.tooltip-text::after {
    display: none;
}

.tooltip:hover .tooltip-text {
    display: none;
}

/* Prevent tooltip from going off right edge for the last element */
.nav-links .tooltip:last-child .tooltip-text {
    left: auto;
    right: 0;
    transform: translateX(0%) scale(0.95) translateY(6px);
}

.nav-links .tooltip:last-child:hover .tooltip-text {
    transform: translateX(0%) scale(1) translateY(0);
}

.nav-links .tooltip:last-child .tooltip-text::after {
    left: auto;
    right: 15px;
    transform: rotate(45deg);
}

.tooltip-text i {
    display: none;
}

main {
    padding: 2rem 4rem;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
    overflow-x: hidden;
}

/* Strong accessible focus states for keyboard navigation */
button:focus-visible,
.search-input:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
.action-btn:focus-visible,
.suggestion-btn:focus-visible,
.send-btn:focus-visible,
.btn-primary:focus-visible,
.close-modal-btn:focus-visible,
.close-genre-modal:focus-visible,
.genre-card:focus-visible,
.book-rec-item:focus-visible {
    outline: 3px solid rgba(212, 175, 55, 0.35);
    outline-offset: 2px;
}

select,
.dropdown {
    transition: background-color 0.28s ease, border-color 0.28s ease, box-shadow 0.28s ease, color 0.28s ease;
}

select:focus,
.dropdown:focus,
input:focus,
textarea:focus {
    box-shadow: 0 0 0 4px rgba(212, 175, 55, 0.12);
    border-color: rgba(212, 175, 55, 0.35);
}

/* --- Hero --- */
.hero {
    text-align: center;
    padding: 6rem 1rem;
    animation: heroFade 1s ease-out;
}

@keyframes heroFade {
    from {
        opacity: 0;
        transform: translateY(15px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}


.hero h1 {
    font-size: clamp(2.5rem, 8vw, 4.5rem);
    margin-bottom: 1.5rem;
    font-style: italic;
    line-height: 1.2;
    letter-spacing: 0.5px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.hero p {
    color: var(--text-muted);
    font-size: 1.2rem;
    line-height: 1.8;
    max-width: 55ch;
    margin: 0 auto;
}

/* --- Curated Tables (Horizontal Scroll) --- */
.curated-section {
    margin-bottom: 6rem;
    width: 100%;
    overflow-x: hidden;
}

.section-header {
    margin: 0 1rem 0.5rem 1rem;
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 1rem;
}

.curated-row {
    display: flex;
    gap: 3rem;
    padding: 2rem 1rem;
    overflow-x: auto;
    overflow-y: hidden;
    /* Allow horizontal scrolling on mobile */
    perspective: 1000px;
    -webkit-overflow-scrolling: touch;
    scroll-behavior: smooth;
    flex-wrap: nowrap;
}

/* --- 3D Book Component --- */
.book-scene {
    width: var(--book-width);
    height: var(--book-height);
    perspective: 1000px;
    cursor: pointer;
    flex-shrink: 0;
    min-width: var(--book-width);
}

.book {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    /* Bouncy cozy feel */
    transform-origin: center center -20px;
    /* Pivot inside the book */
    animation: floatIn 0.8s ease-out backwards;
}

@keyframes floatIn {
    from {
        opacity: 0;
        transform: translateY(50px) scale(0.9);
    }

    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.book.flipped {
    transform: rotateY(180deg) scale(1.2) translateZ(50px);
    /* Expand and bring closer */
    z-index: 100;
}

/* Book Faces */
.book__face {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    /* Hide back when front is clear */
    border-radius: var(--border-radius-soft);
    box-shadow: var(--shadow-soft);
    transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.book__face--front {
    background: var(--book-bg);
    transform: rotateY(0deg);
    z-index: 2;
}

.book__face--front img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 4px 8px 8px 4px;
}

.book__face--back {
    transform: rotateY(180deg);
    background: var(--paper-color);
    /* Paper color */
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    border: 1px solid var(--glass-border);
    z-index: 1;
    color: #2c2420;
    /* Keep text dark for paper feel even in night mode */
}

/* The Spine */
.book__face--spine {
    position: absolute;
    width: var(--book-thick);
    height: 100%;
    left: 0;
    top: 0;
    transform: rotateY(-90deg) translateZ(calc(var(--book-thick) / 2));
}

/* Improved 3D Box Model */
/* Re-defining .book for proper thickness volume */
.book {
    transform-origin: center center -20px;
    /* Pivot inside the book */
}

.book__face--front {
    transform: translateZ(20px);
}

.book__face--back {
    transform: rotateY(180deg) translateZ(20px);
}

.book__face--spine {
    width: 40px;
    height: 100%;
    background: #333;
    /* Default spine color */
    transform: rotateY(-90deg) translateZ(20px);
    /* Adjust positioning to be flush left of front face */
    left: -20px;
    /* Half thickness */
}

.book__face--right {
    /* Pages */
    width: 40px;
    height: 100%;
    background: linear-gradient(to right, #fff, #f0f0f0 20%, #fff 40%);
    transform: rotateY(90deg) translateZ(140px);
    /* Width - half thickness */
    left: auto;
    right: -20px;
}

/* Hover Effect: Pull out */
.book-scene:hover .book:not(.flipped) {
    transform: translateZ(30px) translateY(-10px) rotateY(-10deg);
    filter: drop-shadow(var(--shadow-hover));
}

.book-scene:hover .book__face {
    box-shadow: var(--shadow-hover);
}

/* Glassmorphism Overlay (Quick view) */
.glass-overlay {
    position: absolute;
    bottom: 10px;
    left: 10px;
    right: 10px;
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(8px);
    padding: 0.5rem;
    border-radius: 6px;
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.3s ease;
    pointer-events: none;
    /* Let clicks pass to book */
}

.book-scene:hover .glass-overlay {
    opacity: 1;
    transform: translateY(0);
}

/* Back of book content */
.handwritten-note {
    font-family: "Courier New", Courier, monospace;
    /* Placeholder for handwriting font */
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.4;
    background: #fffdc2;
    padding: 10px;
    transform: rotate(-2deg);
    box-shadow: 2px 2px 5px rgba(0, 0, 0, 0.1);
    margin-bottom: 1rem;
}

/* Read details Button */
.read-details-btn {
    background-color: #3e2723;
    color: #fffdf9;
    border: 1px solid var(--accent-gold);
    padding: 6px 16px;
    border-radius: 6px;
    font-family: 'Playfair Display', 'Georgia', serif;
    font-size: 0.82rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    margin: 8px auto 14px auto;
    width: 96%;
    box-shadow: 0 3px 6px rgba(0, 0, 0, 0.15);
    transition: background-color 0.2s ease-in-out;
    white-space: nowrap;
}

.read-details-btn:hover {
    background-color: #5d4037;
}

.book__face--back .book-actions {
    justify-content: space-around;
    padding: 0 10px;
    width: 100%;
    margin-bottom: -6px;
}

.book-actions {
    display: flex;
    gap: 0.35rem;
    justify-content: center;
    align-items: center;
    width: 100%;
}

.btn-icon {
    border: none;
    background: none;
    cursor: pointer;
    font-size: 1rem;
    padding: 0.15rem 0.25rem;
    opacity: 0.6;
    transition: opacity 0.2s, transform 0.12s;
}

.btn-icon:hover {
    opacity: 1;
    transform: scale(1.08);
}

/* --- Virtual Shelves --- */
.shelves-container {
    width: 100%;
    overflow-x: hidden;
    display: flex;
    flex-direction: column;
    gap: 4rem;
    padding: 2rem 0;
}

.shelf-row {
    position: relative;
    padding: 0 2rem 1.5rem 2rem;
    /* Realistic Wood Texture Gradient */
    background:
        repeating-linear-gradient(90deg,
            transparent 0,
            transparent 4px,
            rgba(0, 0, 0, 0.02) 5px,
            transparent 10px),
        linear-gradient(to bottom, #5d4037 0%, #3e2723 100%);
    border-bottom: 25px solid #281a15;
    /* Thicker front lip */
    border-radius: 4px;
    box-shadow:
        0 20px 20px -10px rgba(0, 0, 0, 0.3),
        inset 0 2px 20px rgba(0, 0, 0, 0.2);
    display: flex;
    align-items: flex-end;
    gap: 1.5rem;
    /* More spacing for expanded books */
    min-height: 280px;
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.shelf-row::after {
    /* Depth shadow on wall behind books */
    content: "";
    position: absolute;
    bottom: 25px;
    /* Above bottom lip */
    left: 0;
    right: 0;
    height: 100%;
    z-index: -1;
    background: linear-gradient(to bottom,
            rgba(0, 0, 0, 0.1),
            rgba(0, 0, 0, 0.4));
    pointer-events: none;
}

.shelf-label {
    position: absolute;
    top: -20px;
    left: 0;
    font-size: 1.2rem;
    color: var(--wood-light);
    font-style: italic;
}

/* --- Mood Analysis Styles --- */

/* Mood Tags on Book Covers */
.mood-tags {
    position: absolute;
    top: 5px;
    left: 5px;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.mood-tag {
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 2px 6px;
    border-radius: 10px;
    font-size: 0.7rem;
    font-weight: bold;
    text-transform: capitalize;
}

/* Mood-specific colors */
.mood-cozy {
    background: #8d6e63 !important;
}

.mood-dark {
    background: #424242 !important;
}

.mood-mysterious {
    background: #5e35b1 !important;
}

.mood-romantic {
    background: #e91e63 !important;
}

.mood-adventurous {
    background: #ff5722 !important;
}

.mood-melancholy {
    background: #607d8b !important;
}

.mood-uplifting {
    background: #4caf50 !important;
}

.mood-intense {
    background: #f44336 !important;
}

.mood-whimsical {
    background: #9c27b0 !important;
}

.mood-thought-provoking {
    background: #795548 !important;
}

/* Glass overlay mood tags */
.glass-mood-tags {
    margin-top: 0.5rem;
    display: flex;
    gap: 0.25rem;
    flex-wrap: wrap;
}

.glass-mood-tag {
    background: rgba(255, 255, 255, 0.3);
    padding: 1px 4px;
    border-radius: 8px;
    font-size: 0.6rem;
    text-transform: capitalize;
}

/* Back of book mood analysis */
.mood-analysis {
    margin-top: 1rem;
    padding-top: 0.5rem;
    border-top: 1px solid rgba(0, 0, 0, 0.1);
}

.mood-tags-back {
    display: flex;
    gap: 0.25rem;
    flex-wrap: wrap;
    margin-top: 0.25rem;
}

.mood-tag-small {
    background: var(--accent-gold);
    color: white;
    padding: 1px 4px;
    border-radius: 6px;
    font-size: 0.6rem;
    text-transform: capitalize;
}

/* Mood Analysis Modal */
.mood-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    backdrop-filter: blur(5px);
}

.mood-modal-content {
    background: var(--book-bg);
    border-radius: 12px;
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: var(--shadow-soft);
    border: 1px solid var(--glass-border);
    display: flex;
    flex-direction: column;
}

.mood-modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--glass-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.mood-modal-header h3 {
    margin: 0;
    color: var(--text-main);
}

.close-modal {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.close-modal:hover {
    color: var(--text-main);
}

.mood-modal-body {
    padding: 1.5rem;
}

.mood-section {
    margin-bottom: 1.5rem;
}

.mood-section h4 {
    margin: 0 0 0.5rem 0;
    color: var(--text-main);
    font-size: 1rem;
}

/* Sentiment Bar */
.sentiment-bar {
    width: 100%;
    height: 8px;
    background: #e0e0e0;
    border-radius: 4px;
    overflow: hidden;
    margin: 0.5rem 0;
}

.sentiment-fill {
    height: 100%;
    background: linear-gradient(to right, #f44336, #ff9800, #4caf50);
    transition: width 0.3s ease;
}

/* Large mood tags in modal */
.mood-tags-large {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.mood-tag-large {
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: bold;
    color: white;
    text-transform: capitalize;
}

/* Vibe quote styling */
.vibe-quote {
    background: var(--paper-color);
    padding: 1rem;
    border-radius: 8px;
    font-style: italic;
    color: #2c2420;
    border-left: 4px solid var(--accent-gold);
    margin: 0.5rem 0;
}

/* Mood button in book actions */
.mood-btn {
    color: var(--accent-gold) !important;
}

.mood-btn:hover {
    color: var(--wood-dark) !important;
    transform: scale(1.1);
}

/* Responsive mood modal */
@media (max-width: 768px) {
    .mood-modal-content {
        width: 95%;
        margin: 1rem;
    }

    .mood-tags-large {
        flex-direction: column;
    }

    .mood-tag-large {
        text-align: center;
    }
}

/* Utilities */
.hidden {
    display: none !important;
}

/* --- Constellation View --- */
.constellation-container {
    width: 100%;
    height: 800px; /* Fixed height for stability */
    min-height: 600px;
    margin-top: 2rem;
    position: relative;
    border-radius: 24px;
    overflow: hidden;
    background: 
        radial-gradient(circle at 50% 0%, rgba(30, 41, 59, 0.7), transparent),
        linear-gradient(to bottom, #020617, #0f172a);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    transition: opacity 0.4s ease, transform 0.4s ease;
    display: flex;
    flex-direction: column;
}

.constellation-container.hidden {
    display: none !important;
}

#constellation-svg {
    flex: 1;
    width: 100%;
    height: 100%;
    display: block;
    cursor: grab;
    will-change: transform;
    background: transparent;
}

.constellation-container:fullscreen {
    width: 100vw;
    height: 100vh;
    border-radius: 0;
    margin: 0;
}

.constellation-container:fullscreen #constellation-svg {
    height: 100vh;
    width: 100vw;
}

/* Node Styling */
.constellation-node {
    outline: none;
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.node-core {
    stroke: rgba(255, 255, 255, 0.8);
    stroke-width: 2;
    transition: all 0.3s ease;
}

.constellation-node:hover .node-core {
    stroke-width: 4;
    filter: brightness(1.3) drop-shadow(0 0 12px currentColor);
}

/* Related Books in Modal */
.related-books-box {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 16px;
    padding: 1.2rem;
    margin-bottom: 1.5rem;
    transition: all 0.3s ease;
}

.related-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 1rem;
    color: var(--accent-gold);
    font-size: 0.95rem;
    font-weight: 600;
}

.related-books-container {
    display: flex;
    gap: 12px;
    overflow-x: auto;
    padding-bottom: 12px;
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.1) transparent;
}

.related-books-container::-webkit-scrollbar {
    height: 4px;
}

.related-books-container::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}

.related-book-item {
    flex: 0 0 90px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
}

.related-book-item:hover {
    transform: translateY(-4px) scale(1.05);
}

.related-book-item img {
    width: 100%;
    aspect-ratio: 2/3;
    object-fit: cover;
    border-radius: 6px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.related-book-title {
    font-size: 0.7rem;
    color: #e2e8f0;
    margin-top: 6px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.2;
    font-weight: 500;
}

.constellation-node.active .node-core {
    stroke: #fff;
    stroke-width: 5;
    filter: brightness(1.5) drop-shadow(0 0 20px currentColor);
}

.constellation-node.dimmed {
    opacity: 0.2;
    filter: grayscale(0.8);
}

.constellation-node text {
    font-family: 'Inter', 'Segoe UI', sans-serif;
    letter-spacing: 0.5px;
    pointer-events: none;
    user-select: none;
    transition: all 0.3s ease;
    opacity: 0.9;
}

.constellation-node.dimmed text {
    opacity: 0;
}

/* Link Styling */
.constellation-link {
    stroke-opacity: 0.15;
    stroke-linecap: round;
    transition: all 0.3s ease;
}

.constellation-link.highlighted {
    stroke-opacity: 0.8;
    stroke-width: 3px !important;
}

.constellation-link.dimmed {
    stroke-opacity: 0.03;
}

/* Toolbar & Legend Overlay */
.constellation-toolbar {
    position: absolute;
    top: 24px;
    right: 24px;
    display: flex;
    gap: 12px;
    z-index: 100;
}

.constellation-toolbar button {
    background: rgba(15, 23, 42, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: #e2e8f0;
    padding: 10px 16px;
    border-radius: 14px;
    backdrop-filter: blur(12px);
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.constellation-toolbar button:hover {
    background: rgba(30, 41, 59, 0.9);
    border-color: var(--accent-gold);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
}

.constellation-legend {
    position: absolute;
    left: 24px;
    bottom: 24px;
    padding: 20px;
    background: rgba(15, 23, 42, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    backdrop-filter: blur(12px);
    z-index: 100;
    color: #f1f5f9;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
    font-size: 13px;
    font-weight: 500;
}

.legend-item:last-child {
    margin-bottom: 0;
}

.legend-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    box-shadow: 0 0 10px currentColor;
    border: 2px solid rgba(255, 255, 255, 0.4);
}

.book-node { color: #facc15; }
.mood-node { color: #8b5cf6; }
.genre-node { color: #10b981; }
.author-node { color: #3b82f6; }
.shelf-node { color: #f97316; }

/* Empty State */
#constellation-empty-state {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: rgba(2, 6, 23, 0.8);
    backdrop-filter: blur(8px);
    z-index: 150;
    color: #94a3b8;
    text-align: center;
    padding: 40px;
}

#constellation-empty-state i {
    font-size: 48px;
    color: var(--accent-gold);
    margin-bottom: 20px;
    opacity: 0.8;
}

#constellation-empty-state h2 {
    color: #f1f5f9;
    font-size: 24px;
    margin-bottom: 12px;
}

@media (max-width: 768px) {
    .constellation-container {
        min-height: 600px;
    }
    .constellation-toolbar {
        top: 16px;
        right: 16px;
        gap: 8px;
    }
    .constellation-toolbar button {
        padding: 8px 12px;
        font-size: 12px;
    }
    .constellation-legend {
        left: 16px;
        bottom: 16px;
        padding: 12px;
    }
}


.constellation-container:fullscreen {
    width: 100vw;
    height: 100vh;
    border-radius: 0;
}

.constellation-container:fullscreen #constellation-svg {
    height: 100vh;
}

.view-toggles button {
    cursor: pointer;
    transition: all 0.3s ease;
}

.view-toggles .active-view {
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    transform: scale(1.05);
}

.fade-in {
    animation: fadeIn 1s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Theme Toggle Button Enhancement */
#themeToggle {
    font-size: 1.4rem;
    color: var(--text-main);
    cursor: pointer;
    transition:
        transform 0.3s ease,
        color 0.3s ease;
}

#themeToggle:hover {
    transform: rotate(15deg) scale(1.1);
    color: var(--accent-gold);
}


.footer {
    min-height: 120px;
    width: 100%;
    background-color: #222;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 1.2rem;
    padding: 2rem 0;
    margin-top: 4rem;
}

.social_icons {
    display: flex;
    gap: 2rem;
    z-index: 999;
}

.social_icons a {
    color: var(--accent-gold);
    font-size: 2rem;
    transition:
        transform 0.3s ease,
        color 0.3s ease;
    text-decoration: none;
}

.social_icons a:hover {
    color: white;
    transform: translateY(-5px);
}

.reading-progress {
    margin-top: 0.75rem;
    opacity: 0.85;
}

.progress-slider {
    width: 100%;
    accent-color: var(--accent-gold);
}

.reading-progress small {
    font-size: 0.7rem;
    opacity: 0.7;
}

/* --- Glass Modal --- */
.glass-modal {
    margin: auto;
    width: 90%;
    max-width: 900px;
    background: transparent;
    border: none;
    padding: 0;
    overflow: visible;
    max-height: 95vh;
}

.glass-modal::backdrop {
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(5px);
}

.modal-content {
    background: rgba(255, 255, 255, 0.65);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    padding: 2.5rem;
    position: relative;
    overflow: hidden;
    overflow-y: auto;
    animation: modalIn 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    max-height: 90vh;
    color: var(--text-main);
}

[data-theme="night"] .modal-content {
    background: rgba(30, 26, 24, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(20px);
    }

    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.close-modal-btn {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    background: var(--glass-bg);
    border: none;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2rem;
    color: var(--text-muted);
    transition: all 0.2s;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10;
}

.close-modal-btn:hover {
    background: var(--accent-gold);
    color: #fff;
    transform: rotate(90deg);
}

.modal-body {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 3rem;
}

.modal-media {
    display: flex;
    justify-content: center;
    align-items: center;
}

.modal-media img {
    width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 10px 10px 30px rgba(0, 0, 0, 0.2);
    transform: rotate(-3deg);
    transition: transform 0.3s;
}

.modal-media img:hover {
    transform: rotate(0) scale(1.02);
}

.modal-info {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.modal-info h2 {
    font-size: 2.5rem;
    line-height: 1.2;
    margin-bottom: 0;
}

.modal-subtitle {
    font-size: 1.2rem;
    color: var(--text-muted);
    font-style: italic;
    margin-top: -1rem;
}

/* AI Insight Box */
.ai-insight-box {
    background: #fdfaf5;
    border: 1px solid rgba(212, 175, 55, 0.2);
    border-left: 4px solid var(--accent-gold);
    padding: 1.2rem 1.5rem;
    border-radius: 12px;
    margin-top: 1.5rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
}

#modal-ai-note {
    font-family: "Georgia", serif;
    font-style: italic;
    color: var(--text-main) !important;
    line-height: 1.6;
    font-size: 1.05rem;
    display: block;
}

[data-theme="night"] .ai-insight-box {
    background: linear-gradient(135deg,
            rgba(255, 255, 255, 0.05),
            rgba(0, 0, 0, 0.2));
}

.ai-insight-box::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg,
            transparent,
            var(--accent-gold),
            transparent);
    opacity: 0.5;
}

.ai-header {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-family: "Courier New", monospace;
    /* Tech feel */
    font-weight: bold;
    color: var(--accent-gold);
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 0.9rem;
}

#modal-summary {
    line-height: 1.6;
    color: var(--text-main);
}

/* Theme-safe modal sub-elements */
.modal-section-title,
.purchase-header,
.purchase-links-box,
.emotion-tagging-section {
    color: var(--text-main);
}

.emotion-tag {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.82rem;
    cursor: pointer;
    border: 1px solid var(--control-border);
    background: var(--surface-soft);
    color: var(--text-main);
    transition: all 0.2s ease;
    margin: 3px 2px;
}

.emotion-tag:hover,
.emotion-tag.active {
    background: var(--accent-gold);
    color: #2c2420;
    border-color: var(--accent-gold);
}

.modal-actions {
    margin-top: auto;
    display: flex;
    gap: 0.75rem;
    align-items: center;
    justify-content: flex-end;
    flex-wrap: wrap;
}

.btn-primary {
    background: var(--text-main);
    color: var(--bg-color);
    border: none;
    padding: 0.8rem 1.25rem;
    min-height: 44px;
    min-width: 140px;
    border-radius: 12px;
    font-family: "Georgia", serif;
    font-size: 1.05rem;
    cursor: pointer;
    transition: all 0.18s ease;
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.btn-primary:hover {
    background: var(--accent-gold);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.12);
}

/* Preview & Secondary buttons aligned with primary style */
.btn-preview,
.btn-secondary {
    min-height: 44px;
    min-width: 120px;
    padding: 0.7rem 1rem;
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    font-family: inherit;
    font-size: 0.98rem;
}

.btn-preview {
    background: transparent;
    color: var(--text-main);
    border: 2px solid var(--glass-border);
}

.btn-preview:hover {
    background: rgba(212,175,55,0.08);
    border-color: var(--accent-gold);
}

.btn-secondary {
    background: transparent;
    border: 1px solid var(--glass-border);
    color: var(--text-main);
}

.btn-secondary:hover {
    background: rgba(0,0,0,0.04);
    transform: translateY(-1px);
}

/* Accessible focus outlines */
.btn-primary:focus-visible,
.btn-preview:focus-visible,
.btn-secondary:focus-visible {
    outline: 3px solid rgba(212,175,55,0.18);
    outline-offset: 3px;
}

/* Make Add to Library button visually match the Preview button */
#modal-add-btn {
    min-height: 44px;
    min-width: 140px;
    padding: 0.8rem 1.25rem;
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    background: transparent;
    border: 2px solid var(--glass-border);
    color: var(--text-main);
    font-family: inherit;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.18s ease;
}

#modal-add-btn:hover {
    background: rgba(212,175,55,0.06);
    border-color: var(--accent-gold);
    transform: translateY(-1px);
}

/* When the book is already in the library show a filled accent state */
#modal-add-btn.library-remove-btn {
    background: linear-gradient(135deg, var(--accent-gold), #e6c44a);
    color: var(--wood-dark);
    border-color: var(--accent-gold);
    box-shadow: 0 8px 28px rgba(212,175,55,0.18);
}

#modal-add-btn.library-remove-btn:hover {
    transform: translateY(-2px);
}

#modal-add-btn:focus-visible {
    outline: 3px solid rgba(212,175,55,0.18);
    outline-offset: 3px;
}

/* Responsive Modal */
@media (max-width: 768px) {
    .modal-body {
        grid-template-columns: 1fr;
    }

    .modal-media img {
        max-width: 200px;
        transform: rotate(0);
    }

    .modal-content {
        padding: 1.5rem;
    }

    .modal-info h2 {
        font-size: 1.8rem;
    }

    .ai-insight-box {
        padding: 1rem 1.2rem;
    }

    #modal-ai-note {
        font-size: 0.95rem;
    }

    .modal-actions {
        flex-direction: column;
        width: 100%;
    }

    .btn-primary,
    .btn-secondary,
    .btn-preview {
        width: 100%;
    }
}

/* ===== CHAT INTERFACE STYLES ===== */

.chat-container {
    max-width: 900px;
    margin: 0 auto;
    height: calc(100vh - 80px);
    display: flex;
    flex-direction: column;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-soft);
}

.chat-header {
    padding: 20px 25px;
    background: var(--glass-bg);
    border-bottom: 1px solid var(--glass-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.bookseller-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.bookseller-avatar {
    width: 50px;
    height: 50px;
    background: var(--accent-gold);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--wood-dark);
    font-size: 20px;
    box-shadow: 0 4px 15px rgba(212, 175, 55, 0.3);
}

.bookseller-details h2 {
    font-family: 'Playfair Display', serif;
    color: var(--text-main);
    font-size: 1.4rem;
    margin-bottom: 4px;
}

.status {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.status-dot {
    width: 8px;
    height: 8px;
    background: #4caf50;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }
}

.chat-actions {
    display: flex;
    gap: 10px;
}

.action-btn {
    width: 40px;
    height: 40px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.action-btn:hover {
    background: var(--accent-gold);
    color: var(--wood-dark);
    transform: translateY(-2px);
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px 25px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.message {
    display: flex;
    gap: 12px;
    max-width: 80%;
}

.message.user-message {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.message-avatar {
    width: 35px;
    height: 35px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    flex-shrink: 0;
}

.bookseller-message .message-avatar {
    background: var(--accent-gold);
    color: var(--wood-dark);
}

.user-message .message-avatar {
    background: var(--wood-light);
    color: var(--paper-color);
}

.message-content {
    flex: 1;
}

.message-bubble {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 18px;
    padding: 15px 18px;
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.user-message .message-bubble {
    background: var(--accent-gold);
    color: var(--wood-dark);
    border-color: var(--accent-gold);
}

.message-bubble p {
    margin-bottom: 8px;
    line-height: 1.5;
    color: var(--text-main);
}

.user-message .message-bubble p {
    color: var(--wood-dark);
}

.message-bubble p:last-child {
    margin-bottom: 0;
}

.message-time {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 5px;
    text-align: left;
}

.user-message .message-time {
    text-align: right;
}

.quick-suggestions {
    padding: 15px 25px;
    border-top: 1px solid var(--glass-border);
    background: var(--glass-bg);
}

.suggestions-header {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.suggestions-list {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.suggestion-btn {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 8px 15px;
    color: var(--text-main);
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 6px;
    backdrop-filter: blur(10px);
}

.suggestion-btn:hover {
    background: var(--accent-gold);
    color: var(--wood-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(212, 175, 55, 0.3);
}

.chat-input-container {
    padding: 20px 25px;
    border-top: 1px solid var(--glass-border);
    background: var(--glass-bg);
}

.chat-input-wrapper {
    display: flex;
    gap: 12px;
    align-items: flex-end;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 20px;
    padding: 12px 15px;
    backdrop-filter: blur(10px);
}

#chatInput {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-main);
    font-size: 1rem;
    line-height: 1.4;
    resize: none;
    min-height: 24px;
    max-height: 120px;
    font-family: inherit;
}

#chatInput::placeholder {
    color: var(--text-muted);
}

.send-btn {
    width: 40px;
    height: 40px;
    background: var(--accent-gold);
    border: none;
    border-radius: 50%;
    color: var(--wood-dark);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.send-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 15px rgba(212, 175, 55, 0.4);
}

.send-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.input-hint {
    margin-top: 8px;
    font-size: 0.8rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 6px;
}

/* Book Recommendations in Chat */
.book-recommendation {
    margin: 15px 0;
    padding: 15px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    backdrop-filter: blur(10px);
}

.book-rec-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.book-rec-title {
    font-weight: 600;
    color: var(--text-main);
    font-size: 0.95rem;
}

.book-rec-count {
    font-size: 0.8rem;
    color: var(--text-muted);
    background: var(--glass-bg);
    padding: 4px 8px;
    border-radius: 10px;
}

.book-rec-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 12px;
}

.book-rec-item {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    padding: 10px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(5px);
}

.book-rec-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
    border-color: var(--accent-gold);
}

.book-rec-cover {
    width: 60px;
    height: 90px;
    background: var(--book-bg);
    border-radius: 4px;
    margin: 0 auto 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    flex-shrink: 0;
}

.book-rec-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.book-rec-cover i {
    font-size: 24px;
    color: var(--text-muted);
}

.book-rec-info h4 {
    font-size: 0.8rem;
    color: var(--text-main);
    margin-bottom: 4px;
    line-height: 1.2;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.book-rec-info p {
    font-size: 0.7rem;
    color: var(--text-muted);
    display: -webkit-box;
    -webkit-line-clamp: 1;
    line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Emotion Tags & Mood Filtering */
.emotion-tags-container {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 12px 0;
}

.emotion-tag {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 4px 12px;
    font-size: 0.75rem;
    color: var(--text-main);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 6px;
}

.emotion-tag:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent-gold);
}

.emotion-tag.active {
    background: var(--accent-gold);
    color: #000;
    border-color: var(--accent-gold);
}

.mood-selector-modal {
    margin-top: 16px;
    padding: 16px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 12px;
    border: 1px solid var(--glass-border);
}

.mood-selector-title {
    font-family: 'Playfair Display', serif;
    font-size: 1rem;
    margin-bottom: 12px;
    color: var(--accent-gold);
}

.mood-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 10px;
}

.mood-item {
    padding: 8px;
    border-radius: 8px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    text-align: center;
    cursor: pointer;
    transition: transform 0.2s;
}

.mood-item:hover {
    transform: scale(1.05);
    border-color: var(--accent-gold);
}

.mood-item i {
    display: block;
    font-size: 1.2rem;
    margin-bottom: 4px;
}

.mood-item span {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Typing Indicator */
.typing-indicator {
    display: flex;
    align-items: center;
    gap: 12px;
    max-width: 80%;
}

.typing-indicator .message-avatar {
    width: 35px;
    height: 35px;
    background: var(--accent-gold);
    color: var(--wood-dark);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
}

.typing-bubble {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 18px;
    padding: 15px 18px;
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    gap: 4px;
}

.typing-dot {
    width: 8px;
    height: 8px;
    background: var(--text-muted);
    border-radius: 50%;
    animation: typing 1.4s infinite ease-in-out;
}

.typing-dot:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-dot:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typing {

    0%,
    60%,
    100% {
        transform: translateY(0);
        opacity: 0.4;
    }

    30% {
        transform: translateY(-10px);
        opacity: 1;
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .chat-container {
        height: calc(100vh - 60px);
        border-radius: 0;
        margin: 0;
    }

    .chat-header {
        padding: 15px 20px;
    }

    .bookseller-details h2 {
        font-size: 1.2rem;
    }

    .chat-messages {
        padding: 15px 20px;
    }

    .message {
        max-width: 90%;
    }

    .suggestions-list {
        flex-direction: column;
    }

    .suggestion-btn {
        justify-content: center;
    }

    .book-rec-grid {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
        gap: 8px;
    }
}

@media (max-width: 480px) {
    .chat-header {
        padding: 12px 15px;
    }

    .bookseller-avatar {
        width: 40px;
        height: 40px;
        font-size: 16px;
    }

    .bookseller-details h2 {
        font-size: 1.1rem;
    }

    .chat-messages {
        padding: 12px 15px;
    }

    .chat-input-container {
        padding: 15px;
    }

    .book-rec-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ===== GENRE SECTION STYLES ===== */
.genre-grid {
    display: grid;

    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 1.25rem;
    padding: 2rem 0.5rem
}

/* Genre Card - Vintage Book Spine Look */
/* Genre Card - Compact Vintage Rectangular Look */
.genre-card {
    display: flex;
    flex-direction: row;
    /* Horizontal layout */
    align-items: center;
    justify-content: flex-start;
    gap: 1rem;
    padding: 1.35rem 1.6rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.23, 1, 0.32, 1);

    /* Rectangular Shape */
    border-radius: 18px;
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.18);

    min-height: 112px;
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(10px);
}

/* Remove gold lines for cleaner small look */
.genre-card::before,
.genre-card::after {
    display: none;
}

.genre-card i {
    font-size: 1.9rem;
    margin-bottom: 0;
    margin-right: 0;
    color: rgba(255, 255, 255, 0.95);
    /* Bright White/Gold */
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s ease;
    flex-shrink: 0;
}

.genre-card span {
    font-family: 'Playfair Display', serif;
    font-size: 1.1rem;
    font-weight: 600;
    color: #f5f5f5;
    text-transform: capitalize;
    /* Easier to read */
    letter-spacing: 0.5px;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
    text-align: left;
    writing-mode: horizontal-tb;
    /* Horizontal Text */
    transform: none;
    line-height: 1.2;
}

.genre-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 30px rgba(0, 0, 0, 0.28);
    z-index: 10;
}

.genre-card:hover i {
    transform: scale(1.1);
    color: #fff;
}

/* Genre Card Colors - Vintage Leather Palette (Deep & Dark) */

/* Romance: Deep Burgundy (Vintage Red) */
.genre-card[data-genre="romance"] {
    background: linear-gradient(90deg, #4a0d24 0%, #751838 40%, #5c112a 100%);
}

/* Mystery: Midnight Navy */
.genre-card[data-genre="mystery"] {
    background: linear-gradient(90deg, #0d1b33 0%, #1a2f52 40%, #12213d 100%);
}

/* Fiction: Classic Dark Green */
.genre-card[data-genre="fiction"] {
    background: linear-gradient(90deg, #0f3316 0%, #1e5228 40%, #163d1e 100%);
}

/* Crime: Charcoal Black */
.genre-card[data-genre="crime"] {
    background: linear-gradient(90deg, #181818 0%, #2e2e2e 40%, #1f1f1f 100%);
}

/* Fantasy: Deep Royal Purple */
.genre-card[data-genre="fantasy"] {
    background: linear-gradient(90deg, #240a3d 0%, #3e1b61 40%, #2e104a 100%);
}

/* Thriller: Burnt Rust/Dark Terracotta */
.genre-card[data-genre="thriller"] {
    background: linear-gradient(90deg, #3d1508 0%, #612712 40%, #4a1a0d 100%);
}

/* Biography: Old Leather Brown */
.genre-card[data-genre="biography"] {
    background: linear-gradient(90deg, #2b1b12 0%, #4e342e 40%, #3e2723 100%);
}

/* Self-Help: Olive Drab */
.genre-card[data-genre="self-help"] {
    background: linear-gradient(90deg, #20330d 0%, #334d16 40%, #273b11 100%);
}

/* Science: Dark Slate/Teal */
.genre-card[data-genre="science"] {
    background: linear-gradient(90deg, #08282e 0%, #14424a 40%, #0e3036 100%);
}

/* History: Worn Bronze/Brown */
.genre-card[data-genre="history"] {
    background: linear-gradient(90deg, #382e1c 0%, #594a2e 40%, #453923 100%);
}

/* Genre Modal Start */

/* Genre Modal */
.genre-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: none;
    padding: 0;
    max-width: 100%;
    max-height: 100%;
    z-index: 10000;
}

.genre-modal::backdrop {
    background: transparent;
}

.genre-modal-content {
    background: var(--bg-color);
    width: 90%;
    max-width: 1100px;
    max-height: 85vh;
    margin: 5vh auto;
    border-radius: 24px;
    overflow: hidden;
    box-shadow: 0 25px 80px rgba(0, 0, 0, 0.3);
    display: flex;
    flex-direction: column;
    color: var(--text-main);
}

.genre-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    background: linear-gradient(to bottom, var(--card-bg), transparent);
}

.genre-modal-header h2 {
    font-family: 'Playfair Display', serif;
    font-size: 1.75rem;
    color: var(--text-main);
    margin: 0;
}

.close-genre-modal {
    width: 44px;
    height: 44px;
    background: transparent;
    border: 1px solid transparent;
    font-size: 1.5rem;
    color: var(--text-muted, rgba(0, 0, 0, 0.6));
    cursor: pointer;
    padding: 0;
    line-height: 1;
    border-radius: 50%;
    flex-shrink: 0;
    aspect-ratio: 1 / 1;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.close-genre-modal:hover {
    background-color: rgba(220, 53, 69, 0.08);
    color: #c9302c;
    transform: scale(1.04);
}

.close-genre-modal:active {
    transform: scale(0.96);
}

[data-theme="night"] .close-genre-modal {
    background-color: transparent;
    border: 1px solid transparent;
    color: rgba(255, 255, 255, 0.7);
}

[data-theme="night"] .close-genre-modal:hover {
    background-color: rgba(255, 99, 104, 0.12);
    border-color: rgba(255, 99, 104, 0.25);
    color: #ffb3b3;
    transform: scale(1.04);
}

.genre-modal-body {
    padding: 2rem;
    overflow-y: auto;
    flex: 1;
}

/* Genre Books Grid */
.genre-books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 1.5rem;
    padding: 2rem;
    perspective: 1000px;
    justify-items: center;
    width: 100%;
    max-width: 100%;
}

.genre-book-card {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    transition: all 0.3s ease;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.genre-book-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.2);
}

.genre-book-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.genre-book-info {
    padding: 1rem;
}

.genre-book-info h4 {
    font-family: 'Playfair Display', serif;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-main);
    margin: 0 0 0.25rem 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.genre-book-info p {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin: 0;
}

.genre-loading {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem;
    color: var(--text-secondary);
    gap: 1rem;
}

.genre-loading i {
    font-size: 2rem;
    color: var(--accent-gold);
}

/* Genre Responsive */
@media (max-width: 900px) {
    .genre-grid {
        grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    }
}

@media (max-width: 600px) {
    .genre-grid {
        grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
        gap: 0.9rem;
    }

    .genre-card {
        min-height: 96px;
        padding: 1rem 1rem;
        gap: 0.85rem;
    }

    .genre-card i {
        font-size: 1.5rem;
    }

    .genre-card span {
        font-size: 0.85rem;
    }

    .genre-modal-content {
        width: 95%;
        max-height: 90vh;
        margin: 2.5vh auto;
    }

    .genre-books-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
}

/* ===== 3D BOOKSHELF STYLES =====  */

/* Main bookshelf container with perspective */
.bookshelf-3d-container {
    perspective: 1200px;
    perspective-origin: center 40%;
    padding: 2rem 0;
    min-height: 400px;
    display: flex;
    flex-direction: column;
}

/* Empty State Placeholder */
.library-empty-state {
    text-align: center;
    padding: 4rem 2rem;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    max-width: 600px;
    margin: 2rem auto;
    animation: fadeIn 0.8s ease-out;
    display: flex;
    flex-direction: column;
    align-items: center;
    box-shadow: var(--shadow-soft);
}

.empty-state-icon {
    font-size: 4rem;
    color: var(--accent-gold);
    margin-bottom: 1.5rem;
    opacity: 0.8;
}

.library-empty-state h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
    font-family: 'Playfair Display', serif;
    font-style: italic;
}

.library-empty-state p {
    color: var(--text-muted);
    font-size: 1.1rem;
    line-height: 1.6;
    max-width: 40ch;
    margin-bottom: 1rem;
}

/* Individual shelf section */
.shelf-section-3d {
    margin-bottom: 4rem;
    position: relative;
    padding-top: 2rem;
    border-top: 4px solid #3e2723;
}

.shelf-section-3d:first-child {
    border-top: none;
    padding-top: 0;
}

.shelf-section-3d .shelf-label {
    position: relative;
    top: auto;
    left: auto;
    margin-bottom: 1.5rem;
    font-size: 1.4rem;
    color: var(--text-main);
    font-style: italic;
    font-family: 'Playfair Display', serif;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #4e342e;
}

/* 3D Wooden Bookshelf */
.bookshelf-3d {
    position: relative;
    transform-style: preserve-3d;
    transform: rotateX(2deg);
    min-height: 350px;
    padding: 30px 40px 20px;
    margin: 0 -20px;

    /* Realistic wood texture */
    background:
        repeating-linear-gradient(90deg,
            transparent 0,
            transparent 3px,
            rgba(0, 0, 0, 0.03) 3px,
            transparent 8px),
        repeating-linear-gradient(0deg,
            transparent 0,
            transparent 50px,
            rgba(0, 0, 0, 0.02) 50px,
            transparent 100px),
        linear-gradient(to bottom,
            #6d4c3d 0%,
            #5d4037 15%,
            #4e342e 50%,
            #3e2723 85%,
            #2c1810 100%);

    border-radius: 4px;
    box-shadow:
        inset 0 5px 15px rgba(0, 0, 0, 0.4),
        inset 0 -3px 10px rgba(255, 255, 255, 0.05),
        0 20px 40px rgba(0, 0, 0, 0.3),
        0 5px 15px rgba(0, 0, 0, 0.2);
}

/* Back wall of shelf */
.bookshelf-3d::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 25px;
    background:
        linear-gradient(to bottom,
            rgba(0, 0, 0, 0.3) 0%,
            rgba(0, 0, 0, 0.1) 100%);
    border-radius: 4px 4px 0 0;
    z-index: -1;
}

/* Front lip of shelf */
.bookshelf-3d::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: -5px;
    right: -5px;
    height: 25px;
    background:
        linear-gradient(to bottom,
            #4e342e 0%,
            #3e2723 40%,
            #2c1810 100%);
    border-radius: 0 0 6px 6px;
    box-shadow:
        0 8px 20px rgba(0, 0, 0, 0.4),
        inset 0 2px 5px rgba(255, 255, 255, 0.1);
    transform: translateZ(20px);
}

/* Books container */
.books-row-3d {
    display: flex;
    align-items: flex-end;
    gap: 0;
    height: 300px;
    padding-bottom: 10px;
    transform-style: preserve-3d;
    position: relative;
    z-index: 1;
}

/* Individual book spine - tilted LEFT like real books */
.book-spine-3d {
    position: relative;
    transform-style: preserve-3d;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.23, 1, 0.32, 1);
    transform-origin: bottom left;
    /* Tilt books to the LEFT (negative rotateZ) */
    transform: rotateZ(-8deg) rotateY(-5deg);
    /* Small gap between books */
    margin-right: 3px;
}

.book-spine-3d:last-child {
    margin-right: 0;
}

.book-spine-3d:nth-child(even) {
    transform: rotateZ(-6deg) rotateY(-4deg);
}

.book-spine-3d:nth-child(3n) {
    transform: rotateZ(-10deg) rotateY(-6deg);
}

.book-spine-3d:nth-child(4n) {
    transform: rotateZ(-7deg) rotateY(-3deg);
}

/* Book spine face (what you see) */
.spine-face {
    height: 100%;
    width: 100%;
    border-radius: 2px 4px 4px 2px;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    padding: 12px 3px;
    position: relative;
    overflow: visible;
    box-shadow:
        inset 0 0 20px rgba(0, 0, 0, 0.2),
        2px 0 8px rgba(0, 0, 0, 0.3);

    /* Subtle texture overlay */
    background-image:
        linear-gradient(to right,
            rgba(0, 0, 0, 0.15) 0%,
            rgba(255, 255, 255, 0.1) 50%,
            rgba(0, 0, 0, 0.1) 100%);
    background-blend-mode: overlay;
}

/* Book spine text */
.spine-title {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    transform: rotate(180deg);
    font-family: 'Georgia', serif;
    font-size: 0.85rem;
    font-weight: 700;
    color: inherit;
    text-align: center;
    line-height: 1.15;
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: visible;
    white-space: nowrap;
    letter-spacing: 0.5px;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
    padding: 5px 2px;
}

.spine-author {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    transform: rotate(180deg);
    font-family: 'Georgia', serif;
    font-size: 0.6rem;
    font-weight: 500;
    opacity: 0.9;
    margin-top: 8px;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    white-space: nowrap;
}

/* Book edge (pages) - hidden for tighter packing */
.book-edge {
    display: none;
}

/* Book cover (top of book when viewed from above) */
.book-top {
    position: absolute;
    top: -6px;
    left: 0;
    right: -8px;
    height: 6px;
    background: linear-gradient(to right,
            var(--spine-color, #5d4037) 0%,
            var(--spine-color, #5d4037) calc(100% - 8px),
            #3e2723 calc(100% - 8px),
            #3e2723 100%);
    transform: rotateX(90deg) translateZ(3px);
    border-radius: 2px 2px 0 0;
}

/* Hover effect - book stands up straight and pulls forward */
.book-spine-3d:hover {
    transform: rotateZ(0deg) rotateY(0deg) translateZ(20px) translateY(-10px);
    z-index: 100;
}

.book-spine-3d:hover .spine-face {
    box-shadow:
        inset 0 0 20px rgba(0, 0, 0, 0.2),
        5px 10px 30px rgba(0, 0, 0, 0.4),
        0 0 15px rgba(212, 175, 55, 0.3);
}

/* Book tooltip */
.book-tooltip {
    position: fixed;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 16px;
    padding: 1.25rem;
    min-width: 280px;
    max-width: 320px;
    box-shadow:
        0 20px 60px rgba(0, 0, 0, 0.2),
        0 8px 25px rgba(0, 0, 0, 0.15);
    z-index: 10000;
    pointer-events: none;
    opacity: 0;
    transform: translateY(10px) scale(0.95);
    transition: all 0.3s cubic-bezier(0.23, 1, 0.32, 1);
}

/* Fix: Ensure light text in day theme for contrast with dark background override */
.book-tooltip .tooltip-title,
.book-tooltip .tooltip-author,
.book-tooltip .tooltip-rating-text,
.book-tooltip .tooltip-description {
    color: #f5f5f5 !important;
}

[data-theme="night"] .book-tooltip {
    background: rgba(44, 36, 32, 0.98);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.book-tooltip.visible {
    opacity: 1;
    transform: translateY(0) scale(1);
}

.tooltip-header {
    display: flex;
    gap: 1rem;
    margin-bottom: 0.75rem;
}

.tooltip-cover {
    width: 60px;
    height: 85px;
    border-radius: 4px;
    object-fit: cover;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    flex-shrink: 0;
}

.tooltip-info {
    flex: 1;
    min-width: 0;
}

.tooltip-title {
    font-family: 'Playfair Display', serif;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 0.25rem;
    line-height: 1.3;
}

.tooltip-author {
    font-size: 1rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.tooltip-rating {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
}

.tooltip-stars {
    color: var(--accent-gold);
    letter-spacing: 2px;
}

.tooltip-rating-text {
    color: var(--text-muted);
}

.tooltip-description {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    border-top: 1px solid rgba(0, 0, 0, 0.08);
    padding-top: 0.75rem;
    margin-top: 0.5rem;
}

[data-theme="night"] .tooltip-description {
    border-top-color: rgba(255, 255, 255, 0.08);
}

.tooltip-hint {
    font-size: 0.75rem;
    color: var(--accent-gold);
    text-align: center;
    margin-top: 0.75rem;
    opacity: 0.9;
}

/* Book Detail Modal */
.book-detail-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at top, rgba(212, 175, 55, 0.12), transparent 38%),
        rgba(0, 0, 0, 0.62);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10001;
    opacity: 0;
    visibility: hidden;
    transition: all 0.4s ease;
    padding: 2rem;
}

.book-detail-modal.active {
    opacity: 1;
    visibility: visible;
}

.book-detail-content {
    background: linear-gradient(180deg, var(--surface-elevated), var(--surface-panel));
    border-radius: var(--radius-panel);
    max-width: 900px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-panel);
    border: 1px solid var(--glass-border);
    transform: translateY(30px) scale(0.95);
    transition: all 0.4s cubic-bezier(0.23, 1, 0.32, 1);
    position: relative;
}

.book-detail-modal.active .book-detail-content {
    transform: translateY(0) scale(1);
}

.modal-close-btn {
    position: absolute;
    top: 15px;
    right: 15px;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    flex-shrink: 0;
    aspect-ratio: 1 / 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    font-size: 1.25rem;
    line-height: 1;
    cursor: pointer;
    z-index: 100;
    transition: all 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    background-color: transparent;
    border: 1px solid transparent; 
    color: var(--text-muted, rgba(0, 0, 0, 0.6));
}

.modal-close-btn:hover {
    background-color: rgba(220, 53, 69, 0.08);
    color: #c9302c;
    transform: scale(1.04);
}

.modal-close-btn:active {
    transform: scale(0.96);
}

[data-theme="night"] .modal-close-btn {
    background-color: transparent;
    border: 1px solid transparent;
    color: rgba(255, 255, 255, 0.7);
}

[data-theme="night"] .modal-close-btn:hover {
    background-color: rgba(255, 99, 104, 0.12);
    border-color: rgba(255, 99, 104, 0.25);
    color: #ffb3b3;
    transform: scale(1.04);
}

.book-detail-grid {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 3rem;
    padding: 2.5rem;
}

.book-expanded-layout {
    display: grid;
    grid-template-columns: minmax(280px, 320px) minmax(0, 1fr);
    gap: 1.5rem;
    align-items: start;
    padding: 1.25rem;
}

.book-cover-section {
    position: relative;
}

.book-cover-3d {
    position: relative;
    transform-style: preserve-3d;
    transform: perspective(800px) rotateY(-15deg);
    transition: transform 0.5s ease;
}

.book-cover-3d:hover {
    transform: perspective(800px) rotateY(-5deg);
}

.book-cover-image {
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow:
        15px 15px 40px rgba(0, 0, 0, 0.3),
        5px 5px 15px rgba(0, 0, 0, 0.2);
}

.book-cover-spine {
    position: absolute;
    left: -20px;
    top: 5px;
    bottom: 5px;
    width: 20px;
    background: linear-gradient(to right,
            rgba(0, 0, 0, 0.3),
            rgba(0, 0, 0, 0.1));
    border-radius: 4px 0 0 4px;
    transform: rotateY(-90deg) translateZ(10px);
}

.book-info-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.book-title-large {
    font-family: 'Playfair Display', serif;
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--text-main);
    line-height: 1.2;
    margin: 0;
}

.book-author-large {
    font-size: 1.25rem;
    color: var(--text-muted);
    font-style: italic;
    margin: 0;
}

.book-meta {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.book-rating-large {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.rating-stars-large {
    font-size: 1.25rem;
    color: var(--accent-gold);
    letter-spacing: 3px;
}

.rating-score {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-main);
}

.rating-count {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.book-categories {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.category-tag {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.book-description-section {
    padding-top: 1rem;
    border-top: 1px solid var(--glass-border);
}

.book-description-section h3 {
    font-family: 'Playfair Display', serif;
    font-size: 1.25rem;
    color: var(--text-main);
    margin-bottom: 1rem;
}

.book-description-text {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--text-muted);
}

.book-reviews-section {
    padding-top: 1.5rem;
    border-top: 1px solid var(--glass-border);
}

.book-reviews-section h3 {
    font-family: 'Playfair Display', serif;
    font-size: 1.25rem;
    color: var(--text-main);
    margin-bottom: 1rem;
}

.review-item {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 1.25rem;
    margin-bottom: 1rem;
}

.review-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.reviewer-name {
    font-weight: 600;
    color: var(--text-main);
}

.review-rating {
    color: var(--accent-gold);
    font-size: 0.9rem;
}

.review-text {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--text-muted);
    font-style: italic;
}

.book-actions-section {
    display: flex;
    gap: 1rem;
    margin-top: auto;
    padding-top: 1.5rem;
}

.action-btn-primary {
    flex: 1;
    padding: 1rem 1.5rem;
    border-radius: 30px;
    border: none;
    font-family: 'Georgia', serif;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.action-btn-primary.add-to-library {
    background: var(--accent-gold);
    color: var(--wood-dark);
}

.action-btn-primary.add-to-library:hover {
    background: #e6c44a;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(212, 175, 55, 0.4);
}

.action-btn-primary.mark-read {
    background: var(--glass-bg);
    border: 2px solid var(--glass-border);
    color: var(--text-main);
}

.action-btn-primary.mark-read:hover {
    background: var(--wood-light);
    color: white;
    border-color: var(--wood-light);
}

/* Empty shelf state for 3D bookshelf */
.empty-shelf-3d {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 180px;
    width: 100%;
    color: rgba(255, 255, 255, 0.6);
    font-style: italic;
    font-size: 1.1rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

/* Responsive styles for 3D bookshelf */
@media (max-width: 900px) {
    .book-detail-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .book-cover-section {
        max-width: 250px;
        margin: 0 auto;
    }

    .book-cover-3d {
        transform: perspective(800px) rotateY(0);
    }

    .book-title-large {
        font-size: 2rem;
        text-align: center;
    }

    .book-author-large {
        text-align: center;
    }

    .book-meta {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .bookshelf-3d {
        padding: 20px 25px 15px;
        transform: rotateX(0);
    }

    .books-row-3d {
        gap: 4px;
        height: 180px;
        overflow-x: auto;
        padding-bottom: 15px;
    }

    .book-spine-3d {
        transform: rotateY(-5deg);
        flex-shrink: 0;
    }

    .book-spine-3d:hover {
        transform: rotateY(-3deg) translateZ(15px) translateY(-10px);
    }

    .book-detail-content {
        border-radius: 20px 20px 0 0;
        max-height: 95vh;
    }

    .book-detail-grid {
        padding: 1.5rem;
    }

    .book-actions-section {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .shelf-section-3d .shelf-label {
        font-size: 1.2rem;
    }

    .bookshelf-3d {
        padding: 15px 20px 10px;
        margin: 0 -10px;
    }

    .books-row-3d {
        height: 160px;
    }

    .spine-title {
        font-size: 0.65rem;
    }

    .spine-author {

        .ai-insight-box,
        .purchase-links-box,
        .price-tracker-section,
        .reading-progress-tracker,
        .book-reviews-section,
        .shelf-selection-row {
            background: var(--surface-soft);
            border: 1px solid var(--glass-border);
            border-radius: 20px;
            padding: 1rem 1.1rem;
            box-shadow: 0 10px 24px rgba(0, 0, 0, 0.05);
        }

        .ai-insight-box {
            position: relative;
            overflow: hidden;
            margin-top: 0.25rem;
        }

        .ai-insight-box::before {
            content: "";
            position: absolute;
            inset: 0;
            border-radius: inherit;
            background: linear-gradient(135deg, rgba(212, 175, 55, 0.08), transparent 45%);
            pointer-events: none;
        }

        .ai-header,
        .purchase-header,
        .price-tracker-header,
        .progress-tracker-header {
            display: inline-flex;
            align-items: center;
            gap: 0.6rem;
            margin-bottom: 0.85rem;
            padding: 0.35rem 0.8rem;
            border-radius: 999px;
            background: rgba(212, 175, 55, 0.12);
            color: var(--accent-gold);
            font-size: 0.85rem;
            font-weight: 700;
            letter-spacing: 0.03em;
        }

        .purchase-links-container {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
        }

        .purchase-links-container a,
        .purchase-link-btn {
            border-radius: 999px !important;
            transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease;
        }

        .purchase-links-container a:hover,
        .purchase-link-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 18px rgba(0, 0, 0, 0.12);
        }

        .price-tracker-section {
            padding-top: 1rem;
        }

        .price-tracker-section input[type="number"] {
            width: 100%;
            padding: 0.75rem 0.95rem 0.75rem 2rem;
            border-radius: 14px;
            border: 1px solid var(--control-border);
            background: var(--control-hover);
            color: var(--text-main);
            transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
        }

        .price-tracker-section input[type="number"]:focus {
            outline: none;
            border-color: var(--accent-gold);
            box-shadow: 0 0 0 4px var(--control-focus-ring);
        }

        .price-tracker-section button,
        .progress-save-btn,
        .progress-mode-btn {
            border-radius: 999px;
        }

        .shelf-selection-row {
            gap: 0.65rem;
            align-items: stretch;
            position: relative;
        }

        .library-select-label {
            font-family: "Georgia", serif;
            font-size: 0.9rem;
            color: var(--text-muted);
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.04em;
        }

        display: none;
    }

    .book-title-large {
        font-size: 1.5rem;
    }
}

/* --- Merge Conflict Resolution: Added styles from feat/issue-21-api-errors --- */
/* Empty State and Error Handling */
.empty-state {

    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem 1rem;
    color: var(--text-muted, #888);
    text-align: center;
    width: 100%;
    min-height: 200px;
}

.empty-state i {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--accent-gold, #d4af37);
    opacity: 0.7;
}

.empty-state p {
    font-family: 'Playfair Display', serif;
    font-size: 1.1rem;
    margin: 0;
}

/* Toast Notifications */
.toast-notification {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: var(--header-bg, #fff);
    color: var(--text-main, #333);
    padding: 1rem 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: 1000;
    font-family: 'Georgia', serif;
    display: flex;
    align-items: center;
    gap: 10px;
    border-left: 4px solid var(--accent-gold);
    animation: slideIn 0.3s ease-out, fadeOut 0.3s ease-in 2.7s forwards;
}

.toast-notification.error {
    border-left-color: #d32f2f;
}

.toast-notification.info {
    border-left-color: var(--accent-gold);
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }

    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes fadeOut {
    from {
        opacity: 1;
    }

    to {
        opacity: 0;
    }
}

/* ========================================= */
/*      BOOK SPINE VARIATIONS (#12)         */
/* ========================================= */

/* --- Textures --- */

/* Leather Texture: subtle noise */
.spine-texture-leather .spine-face {
    background-image:
        url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='0.15'/%3E%3C/svg%3E"),
        linear-gradient(to right, rgba(0, 0, 0, 0.3) 0%, rgba(255, 255, 255, 0.1) 40%, rgba(0, 0, 0, 0.2) 100%);
    background-blend-mode: overlay;
}

/* Cloth Texture: cross-hatch */
.spine-texture-cloth .spine-face {
    background-image:
        repeating-linear-gradient(45deg, rgba(0, 0, 0, 0.05) 0px, rgba(0, 0, 0, 0.05) 1px, transparent 1px, transparent 4px),
        repeating-linear-gradient(-45deg, rgba(0, 0, 0, 0.05) 0px, rgba(0, 0, 0, 0.05) 1px, transparent 1px, transparent 4px),
        linear-gradient(to right, rgba(0, 0, 0, 0.2) 0%, rgba(255, 255, 255, 0.1) 50%, rgba(0, 0, 0, 0.2) 100%);
}

/* Paper/Matte Texture: flat with slight gradient */
.spine-texture-paper .spine-face {
    background-image: linear-gradient(to right, rgba(0, 0, 0, 0.1) 0%, rgba(255, 255, 255, 0.05) 50%, rgba(0, 0, 0, 0.1) 100%);
}

/* Worn/Rough Texture: scratches */
.spine-texture-worn .spine-face {
    background-image:
        url("data:image/svg+xml,%3Csvg width='100' height='100' viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M10 10 L20 20 M50 50 L60 40 M80 20 L70 30' stroke='rgba(0,0,0,0.2)' stroke-width='1' fill='none'/%3E%3C/svg%3E"),
        linear-gradient(to bottom, rgba(0, 0, 0, 0.2) 0%, transparent 10%, transparent 90%, rgba(0, 0, 0, 0.2) 100%),
        linear-gradient(to right, rgba(0, 0, 0, 0.3) 0%, rgba(255, 255, 255, 0.05) 50%, rgba(0, 0, 0, 0.2) 100%);
}


/* --- Patterns (Gold details etc) --- */

.spine-pattern-bands::before {
    content: '';
    position: absolute;
    top: 15%;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--accent-gold);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    pointer-events: none;
}

.spine-pattern-bands::after {
    content: '';
    position: absolute;
    bottom: 20%;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--accent-gold);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    pointer-events: none;
}

.spine-pattern-frame::before {
    content: '';
    position: absolute;
    top: 10%;
    bottom: 15%;
    left: 6px;
    right: 6px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    pointer-events: none;
}

.spine-pattern-ornament::before {
    content: '?';
    /* Floral heart ornament */
    position: absolute;
    bottom: 25%;
    left: 50%;
    transform: translateX(-50%);
    color: var(--accent-gold);
    font-size: 1.2rem;
    opacity: 0.8;
}

/* --- Typography Variations --- */

/* Standard Vertical (Default) */
.spine-title {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-align: center;
    max-height: 75%;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-top: auto;
    margin-bottom: auto;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

/* Serif Classic */
.font-serif .spine-title {
    font-family: 'Playfair Display', serif;
    font-style: italic;
    letter-spacing: 1px;
}

/* Sans Modern */
.font-sans .spine-title {
    font-family: 'Segoe UI', sans-serif;
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 1.5px;
}

/* Handwritten/Personal */
.font-hand .spine-title {
    font-family: 'Georgia', serif;
    /* Fallback for now */
    font-style: italic;
    font-weight: 400;
}

/* Rotated Upwards (European style) */
.title-rotate-up .spine-title {
    transform: rotate(180deg);
}

/* Stacked letters (for very short titles) */
.title-stacked .spine-title {
    writing-mode: horizontal-tb;
    word-break: break-all;
    width: 80%;
    font-size: 1.2rem;
    line-height: 1.1;
}

/* --- User Profile Styles --- */
.profile-header {
    background: linear-gradient(135deg, var(--header-bg), var(--bg-color));
    padding: 3rem 2rem;
    border-bottom: 1px solid var(--glass-border);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

.profile-card {
    background: var(--book-bg);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 2.5rem;
    display: flex;
    align-items: center;
    gap: 2rem;
    box-shadow: var(--shadow-soft);
    max-width: 800px;
    width: 100%;
    position: relative;
    overflow: hidden;
}

.profile-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 6px;
    background: linear-gradient(90deg, var(--wood-dark), var(--wood-light), var(--accent-gold));
}

.profile-avatar-wrapper {
    position: relative;
}

.profile-avatar {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: var(--wood-light);
    color: var(--paper-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3.5rem;
    border: 4px solid var(--bg-color);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.profile-badge {
    position: absolute;
    bottom: 5px;
    right: 5px;
    background: var(--accent-gold);
    color: var(--wood-dark);
    width: 35px;
    height: 35px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    border: 3px solid var(--book-bg);
}

.profile-info h1 {
    font-size: 2.2rem;
    color: var(--text-main);
    margin-bottom: 0.5rem;
}

.profile-email {
    color: var(--text-muted);
    font-family: 'Courier New', monospace;
    font-size: 0.95rem;
    opacity: 0.8;
}

.profile-since {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
    font-style: italic;
}

.profile-actions {
    margin-top: 1.5rem;
    display: flex;
    gap: 1rem;
}

.logout-btn {
    padding: 0.6rem 1.2rem;
    font-size: 0.9rem;
    background: var(--wood-dark);
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.logout-btn:hover {
    background: #d32f2f;
    transform: translateY(-2px);
}

.profile-stats-container {
    display: flex;
    justify-content: center;
    gap: 2rem;
    width: 100%;
    max-width: 800px;
    flex-wrap: wrap;
}

.profile-stat-box {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
    padding: 1.5rem;
    border-radius: 15px;
    text-align: center;
    flex: 1;
    min-width: 140px;
    transition: transform 0.3s ease;
}

.profile-stat-box:hover {
    transform: translateY(-5px);
    border-color: var(--accent-gold);
}

.profile-stat-box i {
    font-size: 1.8rem;
    color: var(--accent-gold);
    margin-bottom: 0.8rem;
}

.profile-stat-box h3 {
    font-size: 1.8rem;
    margin: 0.5rem 0;
    color: var(--text-main);
}

.profile-stat-box span {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
}

.reading-stats-dashboard {
    width: 100%;
    max-width: 800px;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.progress-breakdown {
    text-align: left;
    padding: 1.5rem;
}

.progress-title {
    font-size: 1.2rem !important;
    margin-bottom: 1rem !important;
    color: var(--text-main) !important;
    text-align: left;
    font-family: "Playfair Display", serif;
}

.progress-bar-container {
    display: flex;
    height: 12px;
    border-radius: 6px;
    overflow: hidden;
    background: rgba(0, 0, 0, 0.1);
    margin-bottom: 1rem;
}

.progress-segment {
    transition: width 1s ease-out;
}

.progress-segment.finished {
    background: var(--accent-gold);
}

.progress-segment.current {
    background: var(--wood-light);
}

.progress-segment.want {
    background: var(--text-muted);
    opacity: 0.7;
}

.progress-legend {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.legend-finished {
    color: var(--accent-gold);
    font-size: 0.6rem;
    margin-right: 4px;
}

.legend-current {
    color: var(--wood-light);
    font-size: 0.6rem;
    margin-right: 4px;
}

.legend-want {
    color: var(--text-muted);
    opacity: 0.7;
    font-size: 0.6rem;
    margin-right: 4px;
}

.profile-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 2rem;
    display: grid;
    gap: 3rem;
}

.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.achievement-card {
    background: var(--input-bg);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
    border: 2px solid transparent;
    opacity: 0.6;
    filter: grayscale(100%);
    transition: all 0.3s;
}

.achievement-card.unlocked {
    opacity: 1;
    filter: grayscale(0%);
    border-color: var(--accent-gold);
    background: var(--book-bg);
    box-shadow: 0 5px 15px rgba(212, 175, 55, 0.2);
}

.achievement-card i {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--wood-light);
}

.achievement-card.unlocked i {
    color: var(--accent-gold);
}

.activity-feed {
    background: var(--book-bg);
    border-radius: 15px;
    padding: 2rem;
    box-shadow: var(--shadow-soft);
}

@media (max-width: 768px) {
    .profile-card {
        flex-direction: column;
        text-align: center;
        padding: 2rem 1rem;
    }

    .profile-actions {
        justify-content: center;
    }
}

/* ===== ENHANCED FOOTER STYLES ===== */
.main-footer {
    background: var(--card-bg);
    /* Use card-bg for better contrast in dark mode */
    border-top: 1px solid var(--glass-border);
    padding: 3rem 2rem 1rem;
    margin-top: 4rem;
    color: var(--text-main);
    font-family: 'Georgia', serif;
    position: relative;
    z-index: 10;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--glass-border);
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.footer-brand .logo {
    font-family: 'Playfair Display', serif;
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-main);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-tagline {
    font-style: italic;
    font-size: 1.1rem;
    color: var(--text-muted);
    line-height: 1.6;
    max-width: 300px;
}

.footer-subtext {
    font-size: 0.9rem;
    color: var(--accent-gold);
    font-weight: 600;
}

.footer-nav h3,
.footer-legal h3,
.footer-social h3 {
    font-family: 'Playfair Display', serif;
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
    color: var(--text-main);
}

.footer-nav ul,
.footer-legal ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.footer-nav li a,
.footer-legal li a {
    text-decoration: none;
    color: var(--text-muted);
    transition: all 0.3s ease;
    font-size: 1rem;
    display: inline-block;
}

.footer-nav li a:hover,
.footer-legal li a:hover {
    color: var(--accent-gold);
    transform: translateX(5px);
}

.social-icons {
    display: flex;
    gap: 1rem;
}

.social-icons a {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-main);
    text-decoration: none;
    transition: all 0.3s ease;
}

.social-icons a:hover {
    background: var(--accent-gold);
    color: white;
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.footer-bottom i {
    color: #e74c3c;
    animation: heartbeat 1.5s infinite;
}

@keyframes heartbeat {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.1);
    }
}

@media (max-width: 768px) {
    .footer-container {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }

    .footer-brand {
        align-items: center;
    }

    .social-icons {
        justify-content: center;
    }
}

\n
/* ========================================= */

/* ========================================= */
/*      EXPANDED BOOK VIEW (#45)            */
/* ========================================= */

#book-detail-modal {
    background: rgba(44, 36, 32, 0.85);
    /* Darker, richer overlay */
    backdrop-filter: blur(8px);
    z-index: 2000;
}

#book-detail-modal .book-detail-content {
    background: transparent;
    box-shadow: none;
    border: none;
    width: 95vw;
    max-width: 1300px;
    height: 90vh;
    padding: 0;
    overflow: visible;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    /* Layout wrapper shouldn't block */
}

/* Re-enable pointer events for interactive children */
#book-detail-modal .book-detail-content>* {
    pointer-events: auto;
}



.book-expanded-layout {
    display: flex;
    width: 100%;
    height: 100%;
    gap: 4rem;
    align-items: center;
    justify-content: center;
}

/* --- Left Column: 3D Stage --- */
.book-stage {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    perspective: 2500px;
    /* Dramatic perspective */
    z-index: 10;
    height: 100%;
    min-width: 400px;
}

.book-3d-scene {
    width: 340px;
    height: 520px;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.1s;
    /* smooth rotation on mousemove */
}

/* The actual 3D Book Object */
.book-object {
    width: 100%;
    height: 100%;
    position: absolute;
    transform-style: preserve-3d;
    transition: transform 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
    transform-origin: center center;
    cursor: grab;
}

.book-object:active {
    cursor: grabbing;
}

/* Flipped State (Show Back) */
.book-object.flipped {
    transform: rotateY(-180deg);
}

/* Faces Common Styles */
.book-face {
    position: absolute;
    backface-visibility: hidden;
    /* Crucial */
    -webkit-backface-visibility: hidden;
}

/* ---- FRONT FACE ---- */
.face-front {
    width: 100%;
    height: 100%;
    z-index: 2;
    transform: rotateY(0deg) translateZ(25px);
    /* Push out half thickness (50px / 2) */
    background-color: #eee;
    border-radius: 2px 5px 5px 2px;
    box-shadow: inset 4px 0 10px rgba(0, 0, 0, 0.1);
    /* Curvature hint */
}

.face-front img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 2px 5px 5px 2px;
}

/* Lighting sheen overlay */
.lighting-sheen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(105deg, transparent 20%, rgba(255, 255, 255, 0.2) 25%, transparent 30%);
    pointer-events: none;
    mix-blend-mode: overlay;
}

/* Spine shadow on cover */
.spine-overlay {
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    width: 25px;
    background: linear-gradient(to right, rgba(0, 0, 0, 0.3) 0%, transparent 100%);
    z-index: 3;
    pointer-events: none;
    border-radius: 2px 0 0 2px;
}

/* ---- BACK FACE ---- */
.face-back {
    width: 100%;
    height: 100%;
    transform: rotateY(180deg) translateZ(25px);
    background-color: var(--paper-color, #fffbf0);
    border-radius: 4px 2px 2px 4px;
    overflow: hidden;
    border-left: 2px solid #8d6e63;
    /* Mimic binding */
    box-shadow: inset 10px 0 20px rgba(0, 0, 0, 0.05);
    /* Inner shadow */
}

.back-paper-texture {
    width: 100%;
    height: 100%;
    padding: 3rem 2.5rem;
    background-image:
        linear-gradient(to right, rgba(0, 0, 0, 0.08) 0%, transparent 5%, transparent 95%, rgba(0, 0, 0, 0.04) 100%);
    background-color: #fff9e6;
    display: flex;
    flex-direction: column;
}

.back-content-scroll {
    overflow-y: auto;
    max-height: 100%;
    padding-right: 10px;
    font-family: 'Georgia', serif;
    font-size: 1.1rem;
    line-height: 1.7;
    color: #4a3b32;
    scrollbar-width: thin;
    scrollbar-color: #d4af37 transparent;
}

.synopsis-title {
    font-family: 'Playfair Display', serif;
    font-size: 1.8rem;
    color: #8d6e63;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid rgba(141, 110, 99, 0.2);
    text-align: center;
}

/* ---- SPINE FACE ---- */
.face-spine {
    width: 50px;
    /* Thickness */
    height: 100%;
    background: #2c2420;
    /* Default dark spine */
    transform: rotateY(-90deg) translateZ(170px);
    /* 340px / 2 = 170px */
    position: absolute;
    left: 50%;
    /* Center it before transform */
    margin-left: -25px;
    /* Offset by half width to center */
    border-radius: 2px;
    box-shadow: inset 10px 0 20px rgba(0, 0, 0, 0.4);
}

/* ---- PAGE EDGES (Top, Bottom, Right) ---- */
.face-right {
    width: 48px;
    /* Slightly less than spine to show cover overhang */
    height: 98%;
    background: #fdfaf5;
    transform: rotateY(90deg) translateZ(168px);
    /* Slightly inset */
    margin-left: -24px;
    left: 50%;
    top: 1%;
    /* Page texture lines */
    background-image: repeating-linear-gradient(to right, #e8e4db 0px, #e8e4db 1px, #fdfaf5 1px, #fdfaf5 3px);
    box-shadow: inset 0 0 15px rgba(0, 0, 0, 0.05);
}

.face-top {
    width: 98%;
    height: 48px;
    top: -24px;
    left: 1%;
    transform: rotateX(90deg);
    background: #fffefb;
    background-image: repeating-linear-gradient(90deg, #d3cfc6 0px, #d3cfc6 1px, transparent 1px, transparent 3px);
}

.face-bottom {
    width: 98%;
    height: 48px;
    bottom: -24px;
    left: 1%;
    transform: rotateX(-90deg);
    background: #fffefb;
    background-image: repeating-linear-gradient(90deg, #d3cfc6 0px, #d3cfc6 1px, transparent 1px, transparent 3px);
    box-shadow: inset 0 0 15px rgba(0, 0, 0, 0.1);
}

.flip-instruction {
    margin-top: 3rem;
    color: rgba(255, 255, 255, 0.8);
    font-size: 1rem;
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
    gap: 0.8rem;
    animation: pulse 2.5s infinite;
    text-transform: uppercase;
    font-family: sans-serif;
    font-weight: 300;
}

@keyframes pulse {
    0% {
        opacity: 0.6;
        transform: translateY(0);
    }

    50% {
        opacity: 1;
        transform: translateY(-3px);
    }

    100% {
        opacity: 0.6;
        transform: translateY(0);
    }
}

/* --- Right Column: Info Panel --- */
.book-info-panel {
    flex: 1;
    max-width: 550px;
    background: var(--surface-elevated);
    -webkit-backdrop-filter: blur(14px);
    backdrop-filter: blur(14px);
    padding: 1.75rem;
    border-radius: var(--radius-panel);
    box-shadow: var(--shadow-panel);
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    height: auto;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    pointer-events: auto;
    border: 1px solid var(--glass-border);
}

.book-header {
    border-bottom: 1px solid rgba(212, 175, 55, 0.28);
    padding: 0.25rem 0 1rem 0;
    margin-top: 0.5rem;
}

.book-info-panel .book-title-large {
    font-family: 'Playfair Display', serif;
    font-size: clamp(2.15rem, 4vw, 2.8rem);
    color: var(--text-main);
    line-height: 1.08;
    margin-bottom: 0.5rem;
}

.book-info-panel .book-author-large {
    font-size: 1.15rem;
    color: var(--text-muted);
    font-style: italic;
    font-family: 'Georgia', serif;
}

.book-stats-row {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
    background: var(--surface-soft);
    padding: 1rem 1.1rem;
    border-radius: 18px;
    border: 1px solid var(--glass-border);
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.reviews-scroll-container {
    flex: 1;
    overflow-y: auto;
    padding-right: 15px;
    min-height: 150px;
    margin-top: 1rem;
    font-family: 'Georgia', serif;
    scrollbar-width: thin;
    scrollbar-color: #d4af37 transparent;
}

/* Custom Scrollbar for Reviews */
.reviews-scroll-container::-webkit-scrollbar {
    width: 6px;
}

.reviews-scroll-container::-webkit-scrollbar-track {
    background: transparent;
}

.reviews-scroll-container::-webkit-scrollbar-thumb {
    background-color: var(--wood-light);
    border-radius: 3px;
}

.book-actions-section {
    margin-top: auto;
    padding-top: 1.25rem;
    border-top: 1px solid var(--glass-border);
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
}

.library-actions-group {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    width: 100%;
}

.action-btn-primary {
    flex: 1;
    min-height: 42px;
    padding: 0.7rem 1.05rem;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: none;
    letter-spacing: 0.2px;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    cursor: pointer;
    border: none;
    border-radius: 999px;
}

.add-to-library {
    background-color: var(--wood-dark);
    color: white;
    border: 2px solid transparent;
    /* Maintain alignment with bordered button */
}

.add-to-library:hover {
    background-color: #3e2b25;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(93, 64, 55, 0.3);
}

.book-actions-section .action-btn-secondary,
.book-actions-section .btn-preview,
.book-actions-section .library-share-btn {
    min-height: 42px;
    padding: 0.7rem 1rem;
    border-radius: 999px;
    border: 1px solid var(--glass-border);
    background: var(--surface-soft);
    color: var(--text-main);
    box-shadow: none;
}

.book-actions-section .action-btn-secondary:hover,
.book-actions-section .btn-preview:hover,
.book-actions-section .library-share-btn:hover {
    background: var(--control-hover);
    transform: translateY(-1px);
    border-color: var(--accent-gold);
}

.mark-read {
    background-color: transparent;
    color: var(--wood-dark);
    border: 2px solid var(--wood-dark);
}

.mark-read:hover {
    background-color: var(--wood-dark);
    color: white;
}

/* Mobile Responsive */
@media (max-width: 1024px) {
    .book-expanded-layout {
        flex-direction: column;
        gap: 2rem;
        overflow-y: auto;
        padding: 2rem 0;
    }

    #book-modal-3d .modal-content {
        height: 100vh;
        width: 100vw;
        max-width: none;
        overflow-y: auto;
        /* Allow scrolling entire modal on mobile */
        pointer-events: auto;
        /* Enable scrolling */
        display: block;
        /* Stack */
    }

    .book-stage {
        height: 420px;
        flex: none;
        width: 100%;
        perspective: 1000px;
        margin-top: 2rem;
    }

    .book-3d-scene {
        width: 240px;
        height: 360px;
        transform: scale(0.9);
    }

    .face-spine {
        transform: rotateY(-90deg) translateZ(120px);
    }

    /* 240/2 */
    .face-right {
        transform: rotateY(90deg) translateZ(118px);
        margin-left: -24px;
    }

    .face-front {
        transform: rotateY(0deg) translateZ(25px);
    }

    .face-back {
        transform: rotateY(180deg) translateZ(25px);
    }

    .book-info-panel {
        width: 90%;
        max-width: none;
        margin: 0 auto 2rem;
        padding: 2rem;
        height: auto;
        max-height: none;
        overflow-y: visible;
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    }

    .reviews-scroll-container {
        max-height: 300px;
    }


}

/* 404 Page Styles */
.error-page-body {
    background-image: var(--bg-color);
}

.error-content-wrapper {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    min-height: 60vh;
    padding: 2rem;
}

.error-code {
    font-size: 8rem;
    font-family: 'Playfair Display', serif;
    font-weight: 700;
    color: var(--wood-dark);
    margin: 0;
    opacity: 0.15;
    line-height: 1;
    position: relative;
    z-index: 0;
}

.error-book-icon {
    font-size: 4rem;
    color: var(--wood-light);
    margin-top: -3rem;
    margin-bottom: 2rem;
    z-index: 1;
    position: relative;
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-10px);
    }

    100% {
        transform: translateY(0px);
    }
}

.error-heading {
    font-size: 2.5rem;
    color: var(--text-main);
    margin-bottom: 1rem;
    font-family: 'Playfair Display', serif;
}

.error-subtext {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 500px;
    margin-bottom: 2rem;
    line-height: 1.6;
}

.error-actions {
    display: flex;
    gap: 1rem;
}

.btn-primary {
    background-color: var(--wood-dark);
    color: #fff;
    padding: 0.8rem 1.5rem;
    border-radius: 4px;
    font-family: 'Playfair Display', serif;
    text-decoration: none;
    transition: background-color 0.3s;
}

.btn-primary:hover {
    background-color: var(--wood-light);
}

.btn-outline {
    background-color: transparent;
    color: var(--wood-dark);
    border: 1px solid var(--wood-dark);
    padding: 0.8rem 1.5rem;
    border-radius: 4px;
    font-family: 'Playfair Display', serif;
    text-decoration: none;
    transition: all 0.3s;
}

.btn-outline:hover {
    background-color: var(--wood-dark);
    color: #fff;
}

/* =========================================
   OVERRIDE & FIX 3D BOOK BOX MODEL
   ========================================= */

.book-scene {
    width: var(--book-width);
    height: var(--book-height);
    perspective: 1500px;
    cursor: pointer;
}

.book {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    transform-origin: center center;
    /* Move whole book back by half its thickness so it sits flush when flipped */
    transform: translateZ(calc(var(--book-thick) * -0.5));
    transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.6s, z-index 0.6s;
    animation: floatIn 0.8s ease-out backwards;
}

.book__face {
    position: absolute;
    backface-visibility: hidden;
    /* Default rounded corners just in case */
    border-radius: 4px;
}

.book__face--front {
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: 2;
    transform: translateZ(calc(var(--book-thick) * 0.5));
    background: var(--book-bg);
    border-radius: 4px 8px 8px 4px;
    box-shadow: inset 4px 0 10px rgba(0, 0, 0, 0.1);
}

.book__face--front img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 4px 8px 8px 4px;
}

.book__face--back {
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: 1;
    transform: rotateY(180deg) translateZ(calc(var(--book-thick) * 0.5));
    background: var(--paper-color);
    border-radius: 6px 4px 4px 6px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    border: 1px solid var(--glass-border);
    color: #2c2420;
}

.book__face--spine {
    width: var(--book-thick);
    height: 100%;
    top: 0;
    left: 0;
    /* Center connects at X = half thickness */
    transform: rotateY(-90deg) translateZ(calc(var(--book-thick) * 0.5));
    background: #333;
    /* Override randomly via JS inline style */
    box-shadow: inset -3px 0 6px rgba(0, 0, 0, 0.3), inset 3px 0 6px rgba(255, 255, 255, 0.1);
}

.book__face--right {
    width: var(--book-thick);
    height: 100%;
    top: 0;
    right: 0;
    /* Placed at the right edge */
    left: auto;
    transform: rotateY(90deg) translateZ(calc(var(--book-thick) * 0.5));
    background: repeating-linear-gradient(to right, #fdfbf7 0px, #fdfbf7 2px, #dfd8c8 3px);
    box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.1);
}

.book__face--top {
    width: 100%;
    height: var(--book-thick);
    top: 0;
    left: 0;
    transform: rotateX(90deg) translateZ(calc(var(--book-thick) * 0.5));
    background: repeating-linear-gradient(to bottom, #fdfbf7 0px, #fdfbf7 2px, #dfd8c8 3px);
    box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.1);
}

.book__face--bottom {
    width: 100%;
    height: var(--book-thick);
    bottom: 0;
    left: 0;
    transform: rotateX(-90deg) translateZ(calc(var(--book-thick) * 0.5));
    background: repeating-linear-gradient(to top, #fdfbf7 0px, #fdfbf7 2px, #dfd8c8 3px);
    box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.1);
}

/* Enhancing Interactivity: Better 3D Spin and Popup on Hover */
.book-scene:hover {
    z-index: 50;
    /* Bring scene forward immediately */
}

.book-scene:hover .book:not(.flipped) {
    transform: translateZ(50px) translateY(-15px) rotateX(15deg) rotateY(-25deg);
    box-shadow: -10px 20px 30px rgba(0, 0, 0, 0.2);
}

/* Enhanced Flipped State with 3D Pop */
.book.flipped {
    transform: rotateY(180deg) scale(1.3) translateZ(80px);
    z-index: 100;
}

/* Fixing Flipped Transform */
.book.flipped {
    transform: translateY(-20px) translateZ(100px) rotateY(180deg) scale(1.1) !important;
    z-index: 100 !important;
}

/* === HERO CONTROLS UPGRADE (MATCH YOUR THEME) === */

.sort-controls {
    margin-top: 2rem;
    display: flex;
    justify-content: center;
    gap: 1.2rem;
    flex-wrap: wrap;
    padding: 1rem;
    background: var(--surface-panel);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    box-shadow: var(--shadow-panel);
}

/* Glass dropdown cards */
.filter-group {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    position: relative;
    min-width: 220px;

    background: var(--surface-soft);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);

    border: 1px solid var(--control-border);
    border-radius: var(--radius-control);

    padding: 0.85rem 1rem;

    box-shadow: var(--shadow-soft);
    transition: all 0.3s ease;
}

/* Hover = premium lift */
.filter-group:hover {
    transform: translateY(-2px);
    border-color: var(--accent-gold);
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.12);
}

.filter-group:focus-within {
    border-color: var(--accent-gold);
    box-shadow: 0 0 0 4px var(--control-focus-ring), var(--shadow-soft);
}

/* Icons glow */
.filter-group i {
    color: var(--accent-gold);
    font-size: 14px;
    transition: 0.3s;
}

.filter-group:hover i {
    transform: scale(1.2);
}

/* Select styling */
.sort-select {
    -webkit-appearance: none;
    appearance: none;
    background: transparent;
    border: none;
    outline: none;

    font-family: "Georgia", serif;
    font-size: 14px;
    color: var(--text-main);

    cursor: pointer;
    width: 100%;
    padding-right: 1.5rem;
}

/* Fancy focus */
.sort-select:focus {
    color: var(--accent-gold);
}

.filter-group::after {
    content: "\f078";
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    color: var(--accent-gold);
    font-size: 0.75rem;
    pointer-events: none;
    margin-left: auto;
}

.logo img {
    height: 40px;
}

.search-icon {
    cursor: pointer;
}

.modal-share-btn {
    margin-left: 10px;
    padding: 0.8rem 1.5rem;
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    background: transparent;
    cursor: pointer;
    color: var(--text-main);
    font-family: inherit;
    transition: all 0.3s ease;
}

.library-hero {
    padding-bottom: 2rem;
    position: relative;
}

.library-export-btn {
    position: absolute;
    top: 45px;
    right: 0;
}

.library-empty-link {
    margin-top: 1.5rem;
    text-decoration: none;
}

.shelf-selection-row {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    width: 100%;
}

.library-select-label {
    font-family: "Georgia", serif;
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.library-shelf-select {
    -webkit-appearance: none;
    appearance: none;
    padding: 0 2.2rem 0 1rem;
    border-radius: 16px;
    font-size: 0.95rem;
    height: 44px;
    width: 100%;
    max-width: none;
    border: 1px solid var(--control-border);
    background: linear-gradient(180deg, var(--control-hover), var(--surface-panel));
    color: var(--text-main);
    cursor: pointer;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.35);
    transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease, background-color 0.2s ease;
}

.library-shelf-select:focus {
    outline: none;
    border-color: var(--accent-gold);
    box-shadow: 0 0 0 4px var(--control-focus-ring);
}

.library-shelf-select:hover {
    border-color: var(--accent-gold);
    transform: translateY(-1px);
}

.library-remove-btn {
    background: linear-gradient(135deg, rgba(93, 64, 55, 0.98), rgba(122, 90, 77, 0.98));
    color: #fff8f1;
    padding: 0 20px;
    font-size: 0.8rem;
    font-weight: 600;
    height: 38px;
    border-radius: 19px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    white-space: nowrap;
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 8px 20px rgba(93, 64, 55, 0.22);
}

.library-remove-btn:hover {
    background: linear-gradient(135deg, rgba(77, 54, 47, 0.98), rgba(109, 80, 69, 0.98));
    transform: translateY(-1px);
    box-shadow: 0 10px 22px rgba(93, 64, 55, 0.28);
}

.library-share-btn {
    margin-left: 10px;
    border: 1px solid var(--glass-border);
    background: var(--surface-soft);
    color: var(--text-main);
    padding: 0.3rem 0.6rem;
    border-radius: 20px;
    font-size: 0.75rem;
    height: 32px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.library-empty-state[hidden],
#search-results-section[hidden] {
    display: none !important;
}

/* EXPORT BUTTON UPGRADE */
#export-library {
    position: absolute;
    top: 30px;
    right: 0;

    background: linear-gradient(135deg, var(--wood-dark), var(--wood-light));
    color: #fff;

    border: none;
    border-radius: 12px;

    padding: 10px 16px;
    font-family: "Georgia", serif;
    font-size: 13px;

    cursor: pointer;

    box-shadow: var(--shadow-soft);
    transition: all 0.3s ease;
}

/* Hover = golden premium */
#export-library:hover {
    background: linear-gradient(135deg, var(--accent-gold), #c89b2f);
    transform: translateY(-3px);
    color: #2c2420;
}

/* Responsive fix */
@media (max-width: 600px) {
    #export-library {
        position: static;
        margin-bottom: 1rem;
    }
}


/* ============================================================ */
/* BASE UI COMPONENTS - STABLE VERSION 2.0 */
/* ============================================================ */

/* Force Back to Top Arrow */
.back-to-top {
    position: fixed !important;
    bottom: 6.5rem !important;
    /* Slightly adjusted to fit leaf below */
    right: 2rem !important;
    width: 3.5rem !important;
    height: 3.5rem !important;
    border-radius: 50% !important;
    background: var(--accent-gold) !important;
    color: white !important;
    display: flex !important;
    justify-content: center !important;
    align-items: center !important;
    z-index: 10000 !important;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3) !important;
    cursor: pointer !important;
    border: none !important;
    transition: all 0.3s ease !important;
}

/* Ambient Sanctuary Wrapper Position */
.ambient-sanctuary {
    position: fixed !important;
    bottom: 2.5rem !important;
    right: 2.35rem !important;
    /* Centered relative to arrow */
    z-index: 10001 !important;
}

#ambientToggle {
    width: 2.8rem !important;
    /* Slightly smaller than arrow (3.5rem) */
    height: 2.8rem !important;
    border-radius: 50% !important;
    background: var(--header-bg) !important;
    color: var(--text-main) !important;
    border: 1px solid var(--glass-border) !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    cursor: pointer !important;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2) !important;
    transition: all 0.3s ease !important;
}

#ambientToggle:hover {
    background: var(--accent-gold) !important;
    color: white !important;
    transform: scale(1.05);
}

/* Animated active state for the sanctuary toggle button */
#ambientToggle {
    will-change: transform;
}

#ambientToggle.active {
    transform: scale(1.08) rotate(-8deg) !important;
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.32) !important;
}

#ambientToggle:active {
    transform: scale(0.96) rotate(-2deg) !important;
}

.ambient-panel {
    position: absolute;
    bottom: 60px;
    right: 0;
    width: 260px;
    background: #1e1a18 !important;
    background: var(--header-bg) !important;
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border) !important;
    border-radius: 15px;
    padding: 1.2rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    display: none;
    flex-direction: column;
    gap: 1rem;
    /* Prepare for animated entrance */
    opacity: 0;
    transform: translateY(8px) scale(0.995);
    transition: opacity 260ms cubic-bezier(.2, .9, .3, 1), transform 260ms cubic-bezier(.2, .9, .3, 1);
    z-index: 10002;
}

.ambient-panel.active {
    display: flex !important;
    opacity: 1 !important;
    transform: translateY(0) scale(1) !important;
}

.ambient-option {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.ambient-option span {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.95rem;
}

/* Improved alignment: use a two-column grid so labels line up and controls align consistently */
.ambient-panel .ambient-option,
.ambient-panel .volume-control {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 10px;
}

.ambient-panel .volume-control {
    position: relative;
    display: grid;
    grid-template-columns: auto 1fr;
    align-items: center;
    gap: 10px;
}

.ambient-panel .volume-control .range-wrap {
    grid-column: 2 / 3;
    position: relative;
    width: 100%;
}

/* Library-specific alignment fixes */
.library-page .ambient-panel .volume-control .range-wrap {
    height: 18px;
}

.library-page .ambient-panel .volume-control .range-wrap .range-track,
.library-page .ambient-panel .volume-control .range-wrap .range-fill {
    top: 50%;
    transform: translateY(-50%);
}

.library-page .ambient-panel .volume-control .range-wrap input[type="range"] {
    height: 18px !important;
    padding: 0 !important;
}

/* Final alignment nudge: move the thumb slightly down to perfectly center on the track across pages */
.ambient-panel .volume-control .range-wrap input[type="range"]::-webkit-slider-thumb {
    transform: translateY(2px) !important;
}

.ambient-panel .volume-control .range-wrap input[type="range"]::-moz-range-thumb {
    transform: translateY(2px) !important;
}

/* Library/profile specific small adjustments if needed */
.library-page .ambient-panel .volume-control .range-wrap .range-track,
.library-page .ambient-panel .volume-control .range-wrap .range-fill,
#profile-page .ambient-panel .volume-control .range-wrap .range-track,
#profile-page .ambient-panel .volume-control .range-wrap .range-fill {
    /* keep track centered */
    top: 50% !important;
    transform: translateY(-50%) !important;
}

.ambient-panel .volume-control .range-wrap .range-track {
    position: absolute;
    left: 0;
    right: 0;
    height: 6px;
    background: rgba(0, 0, 0, 0.12);
    border-radius: 999px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 1;
}

.ambient-panel .volume-control .range-wrap .range-fill {
    position: absolute;
    left: 0;
    height: 6px;
    background: var(--accent-gold);
    border-radius: 999px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 2;
    width: 50%;
    transition: width 240ms cubic-bezier(.2, 1, .22, 1);
}

.ambient-panel .volume-control .range-wrap input[type="range"] {
    background: transparent !important;
    position: relative;
    z-index: 3;
    width: 100%;
}

/* Profile-specific nudge: align the track/fill and thumb better on profile layout */
.profile-page .ambient-panel .volume-control .range-wrap {
    padding-top: 2px;
    /* small spacing to shift input area down slightly */
}

.profile-page .ambient-panel .volume-control .range-wrap .range-track,
.profile-page .ambient-panel .volume-control .range-wrap .range-fill {
    top: 54%;
}

.profile-page .ambient-panel .volume-control .range-wrap input[type="range"] {
    height: 20px !important;
}

.profile-page .ambient-panel .volume-control .range-wrap input[type="range"]::-webkit-slider-thumb {
    margin-top: 0 !important;
}

/* Make the input tall enough so the thumb can be vertically centered; remove negative margins */
.ambient-panel .volume-control .range-wrap input[type="range"] {
    height: 18px !important;
    padding: 0 !important;
    margin: 0 !important;
    line-height: 18px !important;
}

/* Ensure the WebKit thumb is not shifted upward */
.ambient-panel .volume-control .range-wrap input[type="range"]::-webkit-slider-thumb {
    margin-top: 0 !important;
    position: relative !important;
    top: 0 !important;
}

/* Ensure the Firefox thumb is vertically centered */
.ambient-panel .volume-control .range-wrap input[type="range"]::-moz-range-thumb {
    margin: 0 !important;
}

.ambient-panel .ambient-option span,
.ambient-panel .volume-control label {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-main);
}

/* Make switches slightly larger and center their internal toggle */
.switch {
    width: 44px;
    height: 26px;
}

.slider {
    border-radius: 999px;
    background-color: rgba(68, 68, 68, 0.9);
}

.slider:before {
    height: 18px;
    width: 18px;
    left: 4px;
    bottom: 4px;
}

/* Smooth transitions for switches */
.slider {
    transition: background-color 200ms cubic-bezier(.2, .9, .3, 1);
}

.slider:before {
    transition: transform 200ms cubic-bezier(.2, .9, .3, 1), box-shadow 200ms;
}

input:checked+.slider {
    background-color: var(--accent-gold);
}

input:checked+.slider:before {
    transform: translateX(18px);
}

/* Quick pop when a toggle is enabled */
input:checked+.slider {
    animation: togglePop 220ms cubic-bezier(.2, .9, .3, 1);
}

@keyframes togglePop {
    0% {
        transform: scale(0.96);
    }

    60% {
        transform: scale(1.04);
    }

    100% {
        transform: scale(1);
    }
}

/* Staggered fade-in for options when panel opens */
.ambient-panel.active .ambient-option,
.ambient-panel.active .volume-control {
    opacity: 0;
    transform: translateY(6px);
    animation: optionFade 360ms cubic-bezier(.2, .9, .3, 1) forwards;
}

.ambient-panel.active .ambient-option:nth-child(1) {
    animation-delay: 0.06s;
}

.ambient-panel.active .ambient-option:nth-child(2) {
    animation-delay: 0.12s;
}

.ambient-panel.active .ambient-option:nth-child(3) {
    animation-delay: 0.18s;
}

.ambient-panel.active .ambient-option:nth-child(4) {
    animation-delay: 0.24s;
}

.ambient-panel.active .volume-control {
    animation-delay: 0.3s;
}

@keyframes optionFade {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Button press micro-interaction */
#ambientToggle {
    transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

#ambientToggle:active {
    transform: scale(0.96) rotate(-6deg);
}

/* Accessible focus for switches */
.switch input:focus-visible+.slider {
    box-shadow: 0 0 0 4px rgba(212, 175, 55, 0.16);
}

/* Volume slider styling */
.ambient-panel input[type="range"] {
    -webkit-appearance: none;
    width: 130px;
    height: 6px;
    background-color: rgba(0, 0, 0, 0.12);
    /* Use a solid gold background-image and size it with --ambient-fill for reliable Chrome rendering */
    background-image: linear-gradient(to right, var(--accent-gold), var(--accent-gold));
    background-size: calc(var(--ambient-fill, 50) * 1%) 100%;
    background-repeat: no-repeat;
    border-radius: 999px;
    outline: none;
}

.ambient-panel input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--accent-gold);
    border-radius: 50%;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25);
    cursor: pointer;
}

/* Ensure base thumb has a transition so scaling animates smoothly on all pages */
.ambient-panel input[type="range"]::-webkit-slider-thumb {
    transition: transform 260ms cubic-bezier(.2, 1, .22, 1), box-shadow 260ms ease !important;
    transform-origin: center center;
    transform: scale(1) !important;
}

/* Animated track fill and thumb pop when volume changes */
.ambient-panel input[type="range"] {
    background: linear-gradient(90deg, var(--accent-gold) var(--ambient-fill, 50%), rgba(0, 0, 0, 0.12) var(--ambient-fill, 50%));
    background-size: 100% 100%;
    background-repeat: no-repeat;
    transition: background 360ms cubic-bezier(.2, 1, .22, 1);
}

.ambient-panel input.volume-animate::-webkit-slider-thumb {
    transform: scale(1.12) !important;
    transition: transform 360ms cubic-bezier(.2, 1, .22, 1) !important;
}

/* Also ensure the base Firefox thumb transitions */
.ambient-panel input[type="range"]::-moz-range-thumb {
    transition: transform 260ms cubic-bezier(.2, 1, .22, 1), box-shadow 260ms ease;
    transform-origin: center center;
}

.ambient-panel input.volume-animate::-moz-range-thumb {
    transform: scale(1.12);
    transition: transform 360ms cubic-bezier(.2, 1, .22, 1);
}

/* Fallback for Firefox: smooth track color via background */
.ambient-panel input[type="range"]::-moz-range-track {
    background: transparent;
}

/* Responsive ambient panel: full width on very small screens */
@media (max-width: 420px) {
    .ambient-panel {
        right: 1rem;
        bottom: 70px;
        width: min(92vw, 320px);
        padding: 0.9rem;
    }

    .ambient-panel input[type="range"] {
        width: 100%;
    }
}

/* Library page: make ambient volume control smaller for compact layout */
.library-page .ambient-panel input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 120px;
    height: 6px;
    background-color: rgba(0, 0, 0, 0.12) !important;
    background-image: linear-gradient(to right, var(--accent-gold), var(--accent-gold)) !important;
    background-size: calc(var(--ambient-fill, 50) * 1%) 100% !important;
    background-repeat: no-repeat !important;
    border-radius: 999px;
    outline: none;
}

.library-page .ambient-panel input[type="range"]::-webkit-slider-runnable-track {
    height: 6px;
    border-radius: 999px;
}

.library-page .ambient-panel input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    margin-top: -6px;
    /* center the larger thumb */
    width: 18px;
    height: 18px;
    background: var(--accent-gold);
    border-radius: 50%;
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.25);
    border: 3px solid rgba(255, 255, 255, 0.8);
    cursor: pointer;
}

.library-page .ambient-panel input[type="range"]::-moz-range-track {
    height: 6px;
    background: transparent;
}

.library-page .ambient-panel input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--accent-gold);
    border-radius: 50%;
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.25);
    border: 3px solid rgba(255, 255, 255, 0.8);
    cursor: pointer;
}

.library-page .ambient-panel .volume-control label {
    font-size: 0.95rem;
}

/* Override responsive minimums that enlarge inputs (loaded in style-responsive.css) */
.library-page .ambient-panel input[type="range"] {
    min-height: 0 !important;
    min-width: 0 !important;
    height: 6px !important;
}

.library-page .ambient-panel input[type="range"]::-webkit-slider-thumb {
    width: 18px !important;
    height: 18px !important;
}

.library-page .ambient-panel input[type="range"]::-moz-range-thumb {
    width: 18px !important;
    height: 18px !important;
}

/* Profile page: same compact ambient volume styling as library */
#profile-page .ambient-panel input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 120px;
    height: 6px;
    background-color: rgba(0, 0, 0, 0.12) !important;
    background-image: linear-gradient(to right, var(--accent-gold), var(--accent-gold)) !important;
    background-size: calc(var(--ambient-fill, 50) * 1%) 100% !important;
    background-repeat: no-repeat !important;
    border-radius: 999px;
    outline: none;
    min-height: 0 !important;
    min-width: 0 !important;
}

#profile-page .ambient-panel input[type="range"]::-webkit-slider-runnable-track {
    height: 6px;
    border-radius: 999px;
}

#profile-page .ambient-panel input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    margin-top: -6px;
    width: 18px;
    height: 18px;
    background: var(--accent-gold);
    border-radius: 50%;
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.25);
    border: 3px solid rgba(255, 255, 255, 0.8);
    cursor: pointer;
}

#profile-page .ambient-panel input[type="range"]::-moz-range-track {
    height: 6px;
    background: transparent;
}

#profile-page .ambient-panel input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--accent-gold);
    border-radius: 50%;
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.25);
    border: 3px solid rgba(255, 255, 255, 0.8);
    cursor: pointer;
}

#profile-page .ambient-panel .volume-control label {
    font-size: 0.95rem;
}

/* Strong overrides to ensure page-scoped slider sizing is applied last */
.library-page .ambient-panel input[type="range"],
.profile-page .ambient-panel input[type="range"] {
    -webkit-appearance: none !important;
    appearance: none !important;
    width: 120px !important;
    height: 6px !important;
    background: linear-gradient(90deg, var(--accent-gold) 50%, rgba(0, 0, 0, 0.12) 50%) !important;
    border-radius: 999px !important;
    outline: none !important;
    min-height: 0 !important;
    min-width: 0 !important;
}

.library-page .ambient-panel input[type="range"]::-webkit-slider-thumb,
.profile-page .ambient-panel input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none !important;
    appearance: none !important;
    margin-top: 0 !important;
    width: 18px !important;
    height: 18px !important;
    background: var(--accent-gold) !important;
    border-radius: 50% !important;
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.25) !important;
    border: 3px solid rgba(255, 255, 255, 0.8) !important;
    cursor: pointer !important;
}

.library-page .ambient-panel input[type="range"]::-moz-range-thumb,
.profile-page .ambient-panel input[type="range"]::-moz-range-thumb {
    width: 18px !important;
    height: 18px !important;
    background: var(--accent-gold) !important;
    border-radius: 50% !important;
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.25) !important;
    border: 3px solid rgba(255, 255, 255, 0.8) !important;
    cursor: pointer !important;
}

.switch {
    position: relative;
    display: inline-block;
    width: 34px;
    height: 20px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #444;
    transition: .4s;
    border-radius: 34px;
}

.slider:before {
    position: absolute;
    content: '';
    height: 14px;
    width: 14px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked+.slider {
    background-color: var(--accent-gold);
}

input:checked+.slider:before {
    transform: translateX(14px);
}

.bookseller-note-card {
    margin-top: 1.5rem;
    padding: 1.4rem;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(14px);
    box-shadow:
        0 8px 30px rgba(0, 0, 0, 0.12);
    transition:
        transform 0.3s ease,
        box-shadow 0.3s ease;
}

.bookseller-note-card:hover {
    transform: translateY(-2px);
    box-shadow:
        0 12px 40px rgba(0, 0, 0, 0.18);
}

.bookseller-note-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.8rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.bookseller-note-label {
    font-family: 'Playfair Display', serif;
    color: var(--accent-gold);
    font-size: 1rem;
    letter-spacing: 0.3px;
}

.bookseller-note-text {
    color: var(--text-secondary);
    line-height: 1.9;
    font-size: 0.97rem;
    font-style: italic;
}


.bookseller-context-hint {
    margin-top: 1rem;
    font-size: 0.78rem;
    opacity: 0.7;
    letter-spacing: 0.4px;
    color: var(--text-muted);
}

.immersive-mood-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.4rem 0.8rem;
    border-radius: 999px;
    background: rgba(212, 175, 55, 0.12);
    border: 1px solid rgba(212, 175, 55, 0.25);
    color: var(--accent-gold);
    font-size: 0.78rem;
    font-weight: 500;
}

.fade-in-note {
    animation: immersiveFade 0.45s ease;
}

@keyframes immersiveFade {
    from {
        opacity: 0;
        transform: translateY(12px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

html,
body {
    cursor: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='32' height='32' viewBox='0 0 24 24'><path fill='%23cca43b' d='M4.42 20.58a1 1 0 0 0 1.41 0L15.24 11.2l-2.44-2.44L3.42 18.17a1 1 0 0 0 0 1.41zM17.36 9.08l-2.44-2.44 2.12-2.12a2 2 0 0 1 2.83 0l1.77 1.77a2 2 0 0 1 0 2.83z'/><path stroke='%23cca43b' stroke-width='1.5' d='M2 22l4-1'/></svg>") 0 24, auto !important;
}

*:hover {
    cursor: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='32' height='32' viewBox='0 0 24 24'><path fill='%23ffca3a' d='M4.42 20.58a1 1 0 0 0 1.41 0L15.24 11.2l-2.44-2.44L3.42 18.17a1 1 0 0 0 0 1.41zM17.36 9.08l-2.44-2.44 2.12-2.12a2 2 0 0 1 2.83 0l1.77 1.77a2 2 0 0 1 0 2.83z'/><path stroke='%23ffca3a' stroke-width='1.5' d='M2 22l4-1'/></svg>") 0 24, pointer !important;
}

#sc-glow-outer,
#sc-glow-mid,
#sc-glow-inner,
#sc-dot {
    position: fixed;
    pointer-events: none;
    border-radius: 50%;
    transform: translate(-50%, -50%);
    will-change: left, top;
}

#sc-glow-outer {
    width: 120px;
    height: 120px;
    background: radial-gradient(circle, rgba(93, 64, 55, 0.25) 0%, transparent 70%);
    filter: blur(18px);
    mix-blend-mode: normal;
    z-index: 99996;
}

#sc-glow-mid {
    width: 60px;
    height: 60px;
    background: radial-gradient(circle, rgba(93, 64, 55, 0.40) 0%, rgba(93, 64, 55, 0.15) 50%, transparent 75%);
    filter: blur(8px);
    mix-blend-mode: normal;
    z-index: 99997;
}

#sc-glow-inner {
    width: 24px;
    height: 24px;
    background: radial-gradient(circle, rgba(93, 64, 55, 0.60) 0%, transparent 100%);
    filter: blur(4px);
    mix-blend-mode: normal;
    z-index: 99998;
}

#sc-dot {
    width: 9px;
    height: 9px;
    background: #5d4037;
    opacity: 1;
    z-index: 99999;
}

[data-theme="night"] #sc-glow-outer {
    background: radial-gradient(circle, rgba(212, 184, 150, 0.12) 4%, transparent 70%);
    mix-blend-mode: normal;
}

[data-theme="night"] #sc-glow-mid {
    background: radial-gradient(circle, rgba(212, 184, 150, 0.25) 0%, rgba(212, 184, 150, 0.07) 50%, transparent 75%);
    mix-blend-mode: normal;
}

[data-theme="night"] #sc-glow-inner {
    background: radial-gradient(circle, rgba(212, 184, 150, 0.5) 0%, transparent 75%);
    mix-blend-mode: normal;
}

[data-theme="night"] #sc-dot {
    background: #D4B896;
}

@media (hover: none) {

    #sc-glow-outer,
    #sc-glow-mid,
    #sc-glow-inner,
    #sc-dot {
        display: none;
    }
}

.sc-sparkle {
    position: fixed;
    pointer-events: none;
    z-index: 99995;
    transform: translate(-50%, -50%);
    animation: sc-pop 0.8s ease-out forwards;
}

@keyframes sc-pop {
    0% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1);
    }

    60% {
        opacity: 0.7;
    }

    100% {
        opacity: 0;
        transform: translate(calc(-50% + var(--dx)), calc(-50% + var(--dy))) scale(0.15);
    }
}

body {
    cursor: none;
}

@media (hover: none) {
    body {
        cursor: auto;
    }
}

body { cursor: none; }
@media (hover: none) { body { cursor: auto; } }

/* Enhanced Empty State */
.library-empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 400px;
    padding: 3rem 1.5rem;
    text-align: center;
    animation: fadeInUp 0.6s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* SVG Illustration */
.empty-state-illustration {
    margin-bottom: 2rem;
}

.empty-shelf-svg {
    filter: drop-shadow(0 4px 12px rgba(0,0,0,0.1));
}

/* Floating animation for book */
.floating-book {
    animation: float 3s ease-in-out infinite;
    transform-origin: center;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

/* Sparkle animations */
.sparkle {
    animation: sparkle 2s ease-in-out infinite;
}

.sparkle-1 { animation-delay: 0s; }
.sparkle-2 { animation-delay: 0.6s; }
.sparkle-3 { animation-delay: 1.2s; }

@keyframes sparkle {
    0%, 100% { opacity: 0; transform: scale(0); }
    50% { opacity: 1; transform: scale(1); }
}

/* Typography */
.empty-state-title {
    font-family: 'Playfair Display', serif;
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    line-height: 1.3;
}

.empty-state-description {
    font-size: 1rem;
    color: var(--text-muted);
    max-width: 400px;
    margin-bottom: 2rem;
    line-height: 1.6;
}

/* CTA Button Enhancement */
.library-empty-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(192, 145, 70, 0.2);
}

.library-empty-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(192, 145, 70, 0.3);
}

.library-empty-link i {
    font-size: 1.1rem;
}

/* Responsive */
@media (max-width: 768px) {
    .empty-state-title {
        font-size: 1.5rem;
    }

    .empty-shelf-svg {
        width: 150px;
        height: 150px;
    }
}
/* ============================================================
   AMBIENT VOLUME SLIDER — SINGLE SOURCE OF TRUTH
   Replace ALL existing slider/range rules in style.css with this block.
   Remove every other rule targeting:
     - .ambient-panel input[type="range"]
     - .library-page .ambient-panel input[type="range"]
     - #profile-page .ambient-panel input[type="range"]
     - .ambient-panel .volume-control .range-wrap ...
     - Any block with margin-top on ::-webkit-slider-thumb inside ambient-panel
   ============================================================ */

/* 1. Volume control layout */
.ambient-panel .volume-control {
    display: grid;
    grid-template-columns: auto 1fr;
    align-items: center;
    gap: 10px;
}

.ambient-panel .volume-control label {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-main);
    font-size: 0.95rem;
    white-space: nowrap;
}

/* 2. The wrapper that stacks track, fill, and input */
.ambient-panel .volume-control .range-wrap {
    position: relative;
    width: 100%;
    height: 18px;
    /* fixed height — track and thumb share this axis */
    display: flex;
    align-items: center;
    /* vertically centers the <input> */
}

/* 3. Track and fill — absolutely positioned, vertically centred */
.ambient-panel .volume-control .range-wrap .range-track,
.ambient-panel .volume-control .range-wrap .range-fill {
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    height: 6px;
    border-radius: 999px;
    pointer-events: none;
}

.ambient-panel .volume-control .range-wrap .range-track {
    right: 0;
    background: rgba(0, 0, 0, 0.15);
    z-index: 1;
}

.ambient-panel .volume-control .range-wrap .range-fill {
    background: var(--accent-gold);
    width: 50%;
    /* JS will update this dynamically */
    transition: width 240ms cubic-bezier(.2, 1, .22, 1);
    z-index: 2;
}

/* 4. The actual <input> — transparent, sits on top */
.ambient-panel .volume-control .range-wrap input[type="range"],
.library-page .ambient-panel .volume-control .range-wrap input[type="range"],
.profile-page .ambient-panel .volume-control .range-wrap input[type="range"],
#profile-page .ambient-panel .volume-control .range-wrap input[type="range"] {
    -webkit-appearance: none !important;
    appearance: none !important;
    position: relative;
    z-index: 3;
    width: 100% !important;
    height: 18px !important;
    /* matches .range-wrap height */
    min-height: 0 !important;
    min-width: 0 !important;
    background: transparent !important;
    border-radius: 999px;
    outline: none;
    cursor: pointer;
    margin: 0 !important;
    padding: 0 !important;
}

/* 5. WebKit track — transparent (fill handled by .range-fill div) */
.ambient-panel .volume-control .range-wrap input[type="range"]::-webkit-slider-runnable-track,
.library-page .ambient-panel .volume-control .range-wrap input[type="range"]::-webkit-slider-runnable-track,
.profile-page .ambient-panel .volume-control .range-wrap input[type="range"]::-webkit-slider-runnable-track,
#profile-page .ambient-panel .volume-control .range-wrap input[type="range"]::-webkit-slider-runnable-track {
    height: 6px !important;
    background: transparent !important;
    border-radius: 999px;
}

/* 6. WebKit thumb — THE KEY FIX: margin-top centers it on the 6px track */
.ambient-panel .volume-control .range-wrap input[type="range"]::-webkit-slider-thumb,
.library-page .ambient-panel .volume-control .range-wrap input[type="range"]::-webkit-slider-thumb,
.profile-page .ambient-panel .volume-control .range-wrap input[type="range"]::-webkit-slider-thumb,
#profile-page .ambient-panel .volume-control .range-wrap input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none !important;
    appearance: none !important;
    width: 18px !important;
    height: 18px !important;
    border-radius: 50% !important;
    background: var(--accent-gold) !important;
    border: 3px solid rgba(255, 255, 255, 0.85) !important;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3) !important;
    cursor: pointer !important;
    margin-top: -6px !important;
    /* (18px thumb - 6px track) / 2 = 6px */
    transform: none !important;
    /* kill any conflicting translateY */
    transition: transform 260ms cubic-bezier(.2, 1, .22, 1),
        box-shadow 260ms ease !important;
}

/* Thumb hover */
.ambient-panel .volume-control .range-wrap input[type="range"]:hover::-webkit-slider-thumb {
    transform: scale(1.15) !important;
    box-shadow: 0 3px 12px rgba(212, 175, 55, 0.5) !important;
}

/* Thumb pop animation (JS adds .volume-animate class) */
.ambient-panel .volume-control .range-wrap input[type="range"].volume-animate::-webkit-slider-thumb {
    transform: scale(1.2) !important;
    box-shadow: 0 0 14px rgba(212, 175, 55, 0.6) !important;
}

/* 7. Firefox track */
.ambient-panel .volume-control .range-wrap input[type="range"]::-moz-range-track,
.library-page .ambient-panel .volume-control .range-wrap input[type="range"]::-moz-range-track,
.profile-page .ambient-panel .volume-control .range-wrap input[type="range"]::-moz-range-track,
#profile-page .ambient-panel .volume-control .range-wrap input[type="range"]::-moz-range-track {
    height: 6px !important;
    background: transparent !important;
    border-radius: 999px;
}

/* 8. Firefox thumb */
.ambient-panel .volume-control .range-wrap input[type="range"]::-moz-range-thumb,
.library-page .ambient-panel .volume-control .range-wrap input[type="range"]::-moz-range-thumb,
.profile-page .ambient-panel .volume-control .range-wrap input[type="range"]::-moz-range-thumb,
#profile-page .ambient-panel .volume-control .range-wrap input[type="range"]::-moz-range-thumb {
    width: 18px !important;
    height: 18px !important;
    border-radius: 50% !important;
    background: var(--accent-gold) !important;
    border: 3px solid rgba(255, 255, 255, 0.85) !important;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3) !important;
    cursor: pointer !important;
    /* Firefox auto-centers the thumb — no margin-top needed */
}

.ambient-panel .volume-control .range-wrap input[type="range"].volume-animate::-moz-range-thumb {
    transform: scale(1.2);
    transition: transform 360ms cubic-bezier(.2, 1, .22, 1);
}

/* ============================================================
   AMBIENT VOLUME SLIDER — SINGLE SOURCE OF TRUTH
   Replace ALL existing slider/range rules in style.css with this block.
   Remove every other rule targeting:
     - .ambient-panel input[type="range"]
     - .library-page .ambient-panel input[type="range"]
     - #profile-page .ambient-panel input[type="range"]
     - .ambient-panel .volume-control .range-wrap ...
     - Any block with margin-top on ::-webkit-slider-thumb inside ambient-panel
   ============================================================ */

/* 1. Volume control layout */
.ambient-panel .volume-control {
    display: grid;
    grid-template-columns: auto 1fr;
    align-items: center;
    gap: 10px;
}

.ambient-panel .volume-control label {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-main);
    font-size: 0.95rem;
    white-space: nowrap;
}

/* 2. The wrapper that stacks track, fill, and input */
.ambient-panel .volume-control .range-wrap {
    position: relative;
    width: 100%;
    height: 18px;
    /* fixed height — track and thumb share this axis */
    display: flex;
    align-items: center;
    /* vertically centers the <input> */
}

/* 3. Track and fill — absolutely positioned, vertically centred */
.ambient-panel .volume-control .range-wrap .range-track,
.ambient-panel .volume-control .range-wrap .range-fill {
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    height: 6px;
    border-radius: 999px;
    pointer-events: none;
}

.ambient-panel .volume-control .range-wrap .range-track {
    right: 0;
    background: rgba(0, 0, 0, 0.15);
    z-index: 1;
}

.ambient-panel .volume-control .range-wrap .range-fill {
    background: var(--accent-gold);
    width: 50%;
    /* JS will update this dynamically */
    transition: width 240ms cubic-bezier(.2, 1, .22, 1);
    z-index: 2;
}

/* 4. The actual <input> — transparent, sits on top */
.ambient-panel .volume-control .range-wrap input[type="range"],
.library-page .ambient-panel .volume-control .range-wrap input[type="range"],
.profile-page .ambient-panel .volume-control .range-wrap input[type="range"],
#profile-page .ambient-panel .volume-control .range-wrap input[type="range"] {
    -webkit-appearance: none !important;
    appearance: none !important;
    position: relative;
    z-index: 3;
    width: 100% !important;
    height: 18px !important;
    /* matches .range-wrap height */
    min-height: 0 !important;
    min-width: 0 !important;
    background: transparent !important;
    border-radius: 999px;
    outline: none;
    cursor: pointer;
    margin: 0 !important;
    padding: 0 !important;
}

/* 5. WebKit track — transparent (fill handled by .range-fill div) */
.ambient-panel .volume-control .range-wrap input[type="range"]::-webkit-slider-runnable-track,
.library-page .ambient-panel .volume-control .range-wrap input[type="range"]::-webkit-slider-runnable-track,
.profile-page .ambient-panel .volume-control .range-wrap input[type="range"]::-webkit-slider-runnable-track,
#profile-page .ambient-panel .volume-control .range-wrap input[type="range"]::-webkit-slider-runnable-track {
    height: 6px !important;
    background: transparent !important;
    border-radius: 999px;
}

/* 6. WebKit thumb — THE KEY FIX: margin-top centers it on the 6px track */
.ambient-panel .volume-control .range-wrap input[type="range"]::-webkit-slider-thumb,
.library-page .ambient-panel .volume-control .range-wrap input[type="range"]::-webkit-slider-thumb,
.profile-page .ambient-panel .volume-control .range-wrap input[type="range"]::-webkit-slider-thumb,
#profile-page .ambient-panel .volume-control .range-wrap input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none !important;
    appearance: none !important;
    width: 18px !important;
    height: 18px !important;
    border-radius: 50% !important;
    background: var(--accent-gold) !important;
    border: 3px solid rgba(255, 255, 255, 0.85) !important;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3) !important;
    cursor: pointer !important;
    margin-top: -6px !important;
    /* (18px thumb - 6px track) / 2 = 6px */
    transform: none !important;
    /* kill any conflicting translateY */
    transition: transform 260ms cubic-bezier(.2, 1, .22, 1),
        box-shadow 260ms ease !important;
}

/* Thumb hover */
.ambient-panel .volume-control .range-wrap input[type="range"]:hover::-webkit-slider-thumb {
    transform: scale(1.15) !important;
    box-shadow: 0 3px 12px rgba(212, 175, 55, 0.5) !important;
}

/* Thumb pop animation (JS adds .volume-animate class) */
.ambient-panel .volume-control .range-wrap input[type="range"].volume-animate::-webkit-slider-thumb {
    transform: scale(1.2) !important;
    box-shadow: 0 0 14px rgba(212, 175, 55, 0.6) !important;
}

/* 7. Firefox track */
.ambient-panel .volume-control .range-wrap input[type="range"]::-moz-range-track,
.library-page .ambient-panel .volume-control .range-wrap input[type="range"]::-moz-range-track,
.profile-page .ambient-panel .volume-control .range-wrap input[type="range"]::-moz-range-track,
#profile-page .ambient-panel .volume-control .range-wrap input[type="range"]::-moz-range-track {
    height: 6px !important;
    background: transparent !important;
    border-radius: 999px;
}

/* 8. Firefox thumb */
.ambient-panel .volume-control .range-wrap input[type="range"]::-moz-range-thumb,
.library-page .ambient-panel .volume-control .range-wrap input[type="range"]::-moz-range-thumb,
.profile-page .ambient-panel .volume-control .range-wrap input[type="range"]::-moz-range-thumb,
#profile-page .ambient-panel .volume-control .range-wrap input[type="range"]::-moz-range-thumb {
    width: 18px !important;
    height: 18px !important;
    border-radius: 50% !important;
    background: var(--accent-gold) !important;
    border: 3px solid rgba(255, 255, 255, 0.85) !important;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3) !important;
    cursor: pointer !important;
    /* Firefox auto-centers the thumb — no margin-top needed */
}

.ambient-panel .volume-control .range-wrap input[type="range"].volume-animate::-moz-range-thumb {
    transform: scale(1.2);
    transition: transform 360ms cubic-bezier(.2, 1, .22, 1);
}

/* --- Mood Sync Theme System Overrides --- */
[data-mood] {
    --bg-color: var(--theme-bg) !important;
    --text-main: var(--theme-text) !important;
    --text-muted: var(--theme-text-muted) !important;
    --input-border: var(--theme-border) !important;
    --book-bg: var(--theme-surface) !important;
    --header-bg: var(--theme-bg) !important;
    --accent-gold: var(--theme-accent) !important;
}

/* === AI CHATBOT WIDGET === */
.chatbot-widget {
    position: fixed;
    bottom: 30px;
    left: 30px;
    /* Moved to bottom-left to avoid overlap with back-to-top and ambient sanctuary */
    z-index: 10000;
    font-family: "Georgia", serif;
}

.chatbot-toggle-btn {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--accent-gold);
    color: var(--wood-dark);
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: var(--shadow-hover);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.chatbot-toggle-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 10px 25px rgba(212, 175, 55, 0.4);
}

.chatbot-window {
    position: absolute;
    bottom: 80px;
    left: 0;
    width: 350px;
    max-width: calc(100vw - 40px);
    background: var(--book-bg);
    border-radius: var(--border-radius-soft);
    box-shadow: var(--shadow-hover);
    border: 1px solid var(--glass-border);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: all 0.3s ease;
    transform-origin: bottom left;
    opacity: 1;
    transform: scale(1);
}

.chatbot-window.hidden {
    opacity: 0;
    transform: scale(0.8);
    pointer-events: none;
}

.chatbot-header {
    background: var(--header-bg);
    backdrop-filter: blur(10px);
    padding: 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--glass-border);
}

.chatbot-bot-info {
    display: flex;
    align-items: center;
    gap: 10px;
}

.chatbot-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--accent-gold);
    color: var(--wood-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

.chatbot-name-status h4 {
    margin: 0;
    font-family: "Playfair Display", serif;
    color: var(--text-main);
    font-size: 1.1rem;
}

.chatbot-status {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-style: italic;
}

.chatbot-close-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1.2rem;
    transition: color 0.2s;
}

.chatbot-close-btn:hover {
    color: var(--text-main);
}

.chatbot-messages {
    height: 350px;
    overflow-y: auto;
    padding: 15px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    background: var(--bg-color);
}

.chat-message {
    max-width: 80%;
    padding: 10px 14px;
    border-radius: 14px;
    font-size: 0.95rem;
    line-height: 1.4;
}

.bot-message {
    align-self: flex-start;
    background: var(--book-bg);
    color: var(--text-main);
    border: 1px solid var(--glass-border);
    border-bottom-left-radius: 4px;
}

.user-message {
    align-self: flex-end;
    background: var(--wood-dark);
    color: var(--paper-color);
    border-bottom-right-radius: 4px;
}

.chatbot-input-area {
    padding: 15px;
    display: flex;
    gap: 10px;
    background: var(--header-bg);
    border-top: 1px solid var(--glass-border);
}

.chatbot-input-area input {
    flex: 1;
    padding: 10px 15px;
    border: 1px solid var(--input-border);
    border-radius: 20px;
    background: var(--input-bg);
    color: var(--text-main);
    font-family: "Georgia", serif;
    outline: none;
}

.chatbot-input-area input:focus {
    border-color: var(--accent-gold);
}

.chatbot-send-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--accent-gold);
    color: var(--wood-dark);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s;
}

.chatbot-send-btn:hover {
    transform: scale(1.1);
}

@media (max-width: 768px) {
    .chatbot-window {
        bottom: 70px;
        width: calc(100vw - 40px);
        left: -10px;
    }
}

/* ===== ENHANCED DROPDOWN MENUS (Library Filter & Sort) ===== */
.sort-controls {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin: 2rem 0;
    flex-wrap: wrap;
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: var(--glass-bg);
    border: 1px solid rgba(0, 0, 0, 0.15);
    /* Match new navbar border */
    border-radius: 12px;
    /* Soft border radii */
    padding: 0.5rem 1rem;
    box-shadow: var(--shadow-soft);
    backdrop-filter: blur(10px);
    transition: border-color 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
}

[data-theme="night"] .filter-group {
    border: 1px solid rgba(255, 255, 255, 0.15);
}

.filter-group:hover {
    border-color: var(--accent-gold);
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

.filter-group i {
    color: var(--accent-gold);
}

.sort-select {
    background: transparent;
    border: none;
    color: var(--text-main);
    font-family: "Georgia", serif;
    font-size: 1rem;
    outline: none;
    cursor: pointer;
    appearance: none;
    padding-right: 1.5rem;
    background-image: url("data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%232c2420%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E");
    background-repeat: no-repeat;
    background-position: right 0.2rem top 50%;
    background-size: 0.65rem auto;
}

[data-theme="night"] .sort-select {
    background-image: url("data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%23e0d5cb%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E");
}

.sort-select option {
    background: var(--bg-color);
    color: var(--text-main);
}
.custom-auth-bg {
    background: linear-gradient(to bottom right, #f8fafc, #dbeafe);
    min-height: 100vh;
}

.auth-btn {
    transition: all 0.3s ease;
}

.auth-btn:hover {
    transform: scale(1.03);
    background: #1e3a8a;
    box-shadow: 0 8px 20px rgba(30, 58, 138, 0.3);
}

html[data-theme="night"] .tooltip-author,
body.night-mode .tooltip-author {
    color: #cccccc !important;
}


.footer-logo {
  height: 40px;
  width: auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.3rem;
  font-weight: bold;
}

.main-footer {
 
  padding: 4rem 2rem 1rem;
}

.footer-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2rem;
}

.footer-container a {
 
  text-decoration: none;
  transition: color 0.3s ease;
}



.social-icons {
  display: flex;
  gap: 1rem;
}

.footer-bottom {
  text-align: center;
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid #374151;
}
/* =========================
   Reader Perspectives
========================= */
.reader-perspectives {
  padding: 4rem 2rem;
  background: var(--bg-color);
}

.perspective-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.perspective-card {
  background: var(--book-bg);
  padding: 2rem;
  border-radius: 12px;
  box-shadow: var(--shadow-soft);
  border: 1px solid var(--glass-border);
}

.perspective-user {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.avatar-circle {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--accent-gold);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.stars {
  color: var(--accent-gold);
  margin: 0;
  letter-spacing: 2px;
}

.perspective-text {
  font-style: italic;
  line-height: 1.6;
  color: var(--text-muted);
}

/* PR 881 - Centering Fixes for Library Icons */
.book__face--back .book-actions .btn-icon i,
.library-actions-group button i {
    font-size: 16px !important;
    width: 16px;
    height: 16px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.book__face--back .book-actions .btn-icon {
    width: 32px;
    height: 32px;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.library-actions-group button {
    padding: 0.5rem 1rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

/* --- Reading Mood Quiz --- */
.reading-mood-quiz {
    padding: 4rem 2rem;
    margin-bottom: 4rem;
    display: flex;
    justify-content: center;
}

.quiz-container {
    background: var(--surface-panel);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-panel);
    padding: 3rem;
    max-width: 800px;
    width: 100%;
    box-shadow: var(--shadow-panel);
    text-align: center;
}

.quiz-container h2 {
    font-family: "Playfair Display", serif;
    font-size: 2.5rem;
    color: var(--text-main);
    margin-bottom: 0.5rem;
    font-style: italic;
}

.quiz-container > p {
    color: var(--text-muted);
    font-size: 1.1rem;
    margin-bottom: 2.5rem;
}

.quiz-question {
    text-align: left;
    margin-bottom: 2rem;
}

.quiz-question h3 {
    font-size: 1.2rem;
    color: var(--text-main);
    margin-bottom: 1rem;
    font-weight: 600;
}

.quiz-options {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
}

.quiz-options button {
    background: transparent;
    border: 1px solid var(--input-border);
    color: var(--text-muted);
    padding: 0.6rem 1.2rem;
    border-radius: 20px;
    font-family: "Georgia", serif;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.quiz-options button:hover {
    background: var(--glass-bg);
    border-color: var(--accent-gold);
    color: var(--text-main);
}

.quiz-options button.selected {
    background: var(--accent-gold);
    color: var(--wood-dark);
    border-color: var(--accent-gold);
    font-weight: bold;
    transform: scale(1.05);
    box-shadow: 0 4px 10px rgba(212, 175, 55, 0.3);
}

.generate-tags-btn {
    background: var(--text-main);
    color: var(--bg-color);
    border: none;
    padding: 1rem 2rem;
    border-radius: 30px;
    font-family: "Georgia", serif;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.3s;
    margin-top: 1rem;
    width: 100%;
    max-width: 300px;
}

.generate-tags-btn:hover:not(:disabled) {
    background: var(--accent-gold);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.generate-tags-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.quiz-results {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px dashed var(--glass-border);
}

.quiz-results h3 {
    font-family: "Playfair Display", serif;
    font-size: 1.5rem;
    color: var(--text-main);
    margin-bottom: 1rem;
}

.mood-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.8rem;
    margin-bottom: 1.5rem;
}

.mood-tags span {
    background: var(--glass-bg);
    border: 1px solid var(--accent-gold);
    color: var(--accent-gold);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: bold;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.retake-quiz-btn {
    background: transparent;
    border: 1px solid var(--text-muted);
    color: var(--text-muted);
    padding: 0.6rem 1.5rem;
    border-radius: 20px;
    font-family: "Georgia", serif;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s;
}

.retake-quiz-btn:hover {
    color: var(--text-main);
    border-color: var(--text-main);
}

/* ── No-results empty state ── */
#no-results-state {
  justify-content: center;
  align-items: center;
  padding: 3rem 1.5rem;
}
.no-results-inner {
  text-align: center;
  max-width: 480px;
  width: 100%;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 1.5rem;
  padding: 2.75rem 2rem;
}
.no-results-icon-wrap {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.25rem;
  font-size: 1.75rem;
}
.no-results-title {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-main, #f0ece3);
  margin: 0 0 0.5rem;
}
.no-results-subtitle {
  font-size: 0.875rem;
  color: var(--text-muted, #a89f91);
  margin: 0 0 0.5rem;
  line-height: 1.6;
}
.no-results-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted, #a89f91);
  margin: 0 0 0.75rem;
}
.no-results-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
}
.mood-suggestion-tag {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgb(0, 0, 0);
  color: var(--text-main, #2810b1ce);
  border-radius: 20rem;
  padding: 0.4rem 1rem;
  font-size: 0.95rem;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.15s ease, border-color 0.15s ease;
}
.mood-suggestion-tag:hover {
  background: rgba(255, 255, 255, 0.13);
  border-color: rgba(255, 255, 255, 0.25);
  transform: translateY(-2px);
}


/* ============================================================ */
/* IN-APP BOOK PREVIEW MODAL (Google Books Embedded Viewer)    */
/* ============================================================ */

/* Backdrop overlay — hidden by default, shown via .active */
dialog.book-preview-modal {
    display: none;
    padding: 0;
    border: none;
    background: transparent;
    margin: auto;
    overflow: visible;
}

dialog.book-preview-modal[open] {
    display: flex;
    align-items: center;
    justify-content: center;
}

dialog.book-preview-modal::backdrop {
    background: rgba(0, 0, 0, 0.78);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
}

/* Inner panel */
.preview-modal-inner {
    background: var(--bg-color);
    border-radius: 20px;
    width: min(92vw, 960px);
    height: min(90vh, 780px);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow:
        0 32px 80px rgba(0, 0, 0, 0.5),
        0 8px 24px rgba(0, 0, 0, 0.3);
    border: 1px solid var(--glass-border);
    position: relative;
    animation: previewModalIn 0.3s cubic-bezier(0.23, 1, 0.32, 1);
}

@keyframes previewModalIn {
    from { opacity: 0; transform: scale(0.94) translateY(16px); }
    to   { opacity: 1; transform: scale(1)    translateY(0);    }
}

/* Header */
.preview-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--glass-border);
    background: var(--header-bg);
    flex-shrink: 0;
    gap: 1rem;
}

.preview-modal-title-wrap {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    min-width: 0;
    flex: 1;
}

.preview-header-icon {
    color: var(--accent-gold);
    font-size: 1.1rem;
    flex-shrink: 0;
}

.preview-modal-title {
    font-family: 'Playfair Display', serif;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-main);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.preview-powered-by {
    font-size: 0.72rem;
    color: var(--text-muted);
    white-space: nowrap;
    flex-shrink: 0;
    padding: 2px 8px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 10px;
}

.preview-close-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    flex-shrink: 0;
    transition: all 0.2s ease;
    position: relative;
    z-index: 10;
}

.preview-close-btn:hover {
    background: var(--accent-gold);
    color: #2c2420;
    border-color: var(--accent-gold);
    transform: rotate(90deg);
}

/* Body */
.preview-modal-body {
    flex: 1;
    position: relative;
    overflow: hidden;
    background: #f5f5f5;
    min-height: 0;
}

[data-theme="night"] .preview-modal-body {
    background: #1a1614;
}

/* Loading state */
.preview-loading {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1.2rem;
    background: var(--bg-color);
    z-index: 2;
}

.preview-loading p {
    color: var(--text-muted);
    font-family: 'Georgia', serif;
    font-style: italic;
    font-size: 1rem;
}

.preview-loading-spinner {
    width: 44px;
    height: 44px;
    border: 3px solid var(--glass-border);
    border-top-color: var(--accent-gold);
    border-radius: 50%;
    animation: previewSpin 0.8s linear infinite;
}

@keyframes previewSpin {
    to { transform: rotate(360deg); }
}

/* Viewer container — Google injects its iframe here */
.preview-viewer-container {
    width: 100%;
    height: 100%;
    position: absolute;
    inset: 0;
}

.preview-viewer-container iframe {
    width: 100% !important;
    height: 100% !important;
    border: none !important;
    display: block !important;
}

/* Fallback state */
.preview-fallback {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    padding: 2rem;
    background: var(--bg-color);
    text-align: center;
    z-index: 2;
}

.preview-fallback-icon {
    font-size: 3.5rem;
    color: var(--accent-gold);
    opacity: 0.6;
    margin-bottom: 0.5rem;
}

.preview-fallback-title {
    font-family: 'Playfair Display', serif;
    font-size: 1.5rem;
    color: var(--text-main);
    margin: 0;
}

.preview-fallback-msg {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
    max-width: 38ch;
    margin: 0;
}

.preview-external-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.5rem;
    padding: 0.65rem 1.4rem;
    background: var(--accent-gold);
    color: #2c2420;
    border-radius: 24px;
    font-family: 'Georgia', serif;
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.25s ease;
    box-shadow: 0 4px 12px rgba(212, 175, 55, 0.3);
}

.preview-external-link:hover {
    background: #e6c44a;
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(212, 175, 55, 0.4);
}

/* Footer */
.preview-modal-footer {
    padding: 0.6rem 1.5rem;
    border-top: 1px solid var(--glass-border);
    background: var(--header-bg);
    flex-shrink: 0;
}

.preview-disclaimer {
    font-size: 0.75rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.4rem;
    margin: 0;
}

.preview-disclaimer i {
    color: var(--accent-gold);
    flex-shrink: 0;
}

/* Preview trigger button */
.btn-preview {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.65rem 1.2rem;
    background: transparent;
    border: 1.5px solid var(--accent-gold);
    color: var(--accent-gold);
    border-radius: 24px;
    font-family: 'Georgia', serif;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.25s ease;
    white-space: nowrap;
}

.btn-preview:hover {
    background: var(--accent-gold);
    color: #2c2420;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(212, 175, 55, 0.3);
}

.btn-preview i {
    font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 768px) {
    .preview-modal-inner {
        width: 100vw;
        height: 100vh;
        border-radius: 0;
        border: none;
    }

    .preview-modal-header {
        padding: 0.85rem 1rem;
    }

    .preview-powered-by {
        display: none;
    }

    .preview-modal-footer {
        padding: 0.5rem 1rem;
    }
}

@media (max-width: 480px) {
    .preview-modal-title {
        font-size: 0.95rem;
    }
}
/* ── Reading Time Badge — Issue #606 ── */
.reading-time-badge,
.reading-time-remaining {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 0.7rem;
    padding: 3px 8px;
    border-radius: 10px;
    margin-bottom: 6px;
}

.reading-time-badge {
    background: rgba(212, 175, 55, 0.15);
    color: var(--accent-gold);
    border: 1px solid rgba(212, 175, 55, 0.3);
}

.reading-time-remaining {
    background: rgba(29, 158, 117, 0.12);
    color: #1D9E75;
    border: 1px solid rgba(29, 158, 117, 0.25);
}