style.css

/* =========================================================
   A research notebook: graph paper by day, blackboard by night.
   Serif for reading, handwriting only for the margins.
   ========================================================= */

:root {
  --paper: #fbf8f1;
  --grid: rgba(70, 110, 170, .13);
  --margin-line: rgba(200, 60, 60, .45);
  --ink: #1f2a44;          /* blue-black fountain pen */
  --ink-2: #4a5570;
  --pencil: #75756e;
  --red: #c0392b;          /* correcting pen */
  --hl: rgba(255, 214, 0, .55);
  --tape: rgba(236, 222, 170, .8);
  --polaroid: #ffffff;
  --card: rgba(255, 255, 255, .6);
  --line: rgba(31, 42, 68, .16);
  --code-bg: rgba(255, 255, 255, .72);
  --serif: "Source Serif 4", Georgia, "Songti SC", "STSong", "Noto Serif SC", serif;
  --hand: "Caveat", "Long Cang", "Kaiti SC", cursive;
  --hand-zh: "Caveat", "Long Cang", "Kaiti SC", cursive; /* Caveat for Latin/digits/§, Long Cang for CJK */
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #1e2a24; --grid: rgba(255, 255, 255, .045); --margin-line: rgba(255, 150, 140, .25);
    --ink: #ecebe4; --ink-2: #c3c7bd; --pencil: #979d93; --red: #f4a49a;
    --hl: rgba(255, 230, 120, .28); --tape: rgba(230, 220, 190, .35); --polaroid: #e9e6dc;
    --card: rgba(255, 255, 255, .04); --line: rgba(236, 235, 228, .16); --code-bg: rgba(0, 0, 0, .22);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #1e2a24; --grid: rgba(255, 255, 255, .045); --margin-line: rgba(255, 150, 140, .25);
  --ink: #ecebe4; --ink-2: #c3c7bd; --pencil: #979d93; --red: #f4a49a;
  --hl: rgba(255, 230, 120, .28); --tape: rgba(230, 220, 190, .35); --polaroid: #e9e6dc;
  --card: rgba(255, 255, 255, .04); --line: rgba(236, 235, 228, .16); --code-bg: rgba(0, 0, 0, .22);
  color-scheme: dark;
}

html[data-lang="zh"] .en { display: none !important; }
html:not([data-lang="zh"]) .zh { display: none !important; }

/* ---------- base ---------- */
* { box-sizing: border-box; }
body {
  margin: 0; color: var(--ink); font-family: var(--serif); font-size: 17.5px; line-height: 1.7;
  background-color: var(--paper);
  background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 24px 24px;
  -webkit-font-smoothing: antialiased;
}
html[data-lang="zh"] body { line-height: 1.9; }
a { color: inherit; text-decoration-color: var(--red); text-underline-offset: 3px; }
a:hover { color: var(--red); }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
:focus-visible { outline: 1.5px dashed var(--red); outline-offset: 3px; }
::selection { background: var(--hl); }
p { margin: 0 0 14px; }
b, strong { font-weight: 600; }
.hand { font-family: var(--hand); }
html[data-lang="zh"] .hand { font-family: var(--hand-zh); }

/* ---------- sheet: margin | text | marginalia ---------- */
.sheet { max-width: 1080px; margin: 0 auto; padding: 30px 28px 80px; position: relative; }
.sheet::before { content: ""; position: absolute; top: 0; bottom: 0; left: 92px; width: 2px; background: var(--margin-line); }
.row { display: grid; grid-template-columns: 70px minmax(0, 660px) minmax(0, 1fr); column-gap: 34px; }
.num { font-family: var(--hand); font-size: 28px; color: var(--red); text-align: right; line-height: 1.2; padding-top: 4px; }
html[data-lang="zh"] .num { font-family: var(--hand-zh); font-size: 25px; }
.note { font-family: var(--hand); font-size: 22px; line-height: 1.15; color: var(--red); padding-top: 6px; }
html[data-lang="zh"] .note { font-family: var(--hand-zh); font-size: 20px; line-height: 1.35; }
.note.pencil { color: var(--pencil); }
section { margin-top: 64px; scroll-margin-top: 20px; }

/* ---------- top bar ---------- */
.topbar { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline; gap: 6px 18px; font-family: var(--hand); font-size: 23px; color: var(--pencil); }
html[data-lang="zh"] .topbar { font-family: var(--hand-zh); font-size: 21px; }
.tabs a { text-decoration: none; color: var(--ink-2); padding: 0 2px; }
.tabs a:hover { color: var(--red); }
.tabs a[aria-current="page"] { color: var(--red); text-decoration: underline wavy var(--red); text-underline-offset: 6px; text-decoration-thickness: 1.5px; }
.tabs .sep { color: var(--pencil); margin: 0 4px; }
.ctl button { color: var(--ink-2); padding: 0 4px; }
.ctl button:hover { color: var(--red); }

/* ---------- headings ---------- */
h1 { font-family: var(--serif); font-weight: 400; font-style: italic; font-size: clamp(46px, 7vw, 72px); line-height: 1.05; margin: 22px 0 10px; letter-spacing: -.01em; }
.tagline { font-size: 19px; color: var(--ink-2); margin: 0 0 6px; }
h2 { font-family: var(--hand); font-weight: 700; font-size: 34px; line-height: 1.1; margin: 0 0 12px; }
html[data-lang="zh"] h2 { font-family: var(--hand-zh); font-weight: 400; font-size: 32px; }
h3.sub { font-family: var(--hand); font-size: 25px; font-weight: 500; margin: 22px 0 6px; color: var(--ink-2); }
html[data-lang="zh"] h3.sub { font-family: var(--hand-zh); font-size: 23px; font-weight: 400; }
h3.sub:first-child { margin-top: 0; }
.mark { padding: 0 1px; }

/* ---------- worked problem ---------- */
.given { font-style: italic; color: var(--ink-2); }
.step { display: grid; grid-template-columns: 30px minmax(0, 1fr); column-gap: 8px; margin: 10px 0; }
.step .k { font-family: var(--hand); font-size: 24px; color: var(--pencil); line-height: 1.3; }
.result { display: inline-block; max-width: 100%; margin: 14px 0 6px; padding: 8px 16px; }
.katex { font-size: 1.05em; }
.katex-display { overflow-x: auto; overflow-y: hidden; padding: 2px 0; }
.qed { font-family: var(--hand); font-size: 26px; color: var(--ink-2); }
.fig svg { display: block; width: 100%; height: auto; overflow: visible; }
.fig-cap { font-family: var(--hand); font-size: 21px; color: var(--pencil); text-align: center; margin-top: 2px; line-height: 1.2; }
html[data-lang="zh"] .fig-cap { font-family: var(--hand-zh); font-size: 19px; }

/* ---------- research ---------- */
.cols { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.todo { list-style: none; margin: 0; padding: 0; }
.todo li { position: relative; padding-left: 28px; margin: 8px 0 14px; }
.todo li::before { content: "□"; position: absolute; left: 0; top: -2px; font-family: var(--hand); font-size: 23px; color: var(--pencil); }
.todo li.done::before { content: "☑"; color: var(--red); }
.todo .it { font-weight: 600; }
.todo small { display: block; color: var(--ink-2); font-size: 15px; line-height: 1.55; margin-top: 2px; }
.todo .more { font-family: var(--hand); font-size: 19px; color: var(--red); text-decoration: none; }
html[data-lang="zh"] .todo .more { font-family: var(--hand-zh); font-size: 17px; }
.todo .more:hover { text-decoration: underline; }

/* ---------- papers ---------- */
.filters { display: flex; flex-wrap: wrap; gap: 2px 14px; margin: 0 0 16px; font-family: var(--hand); font-size: 22px; }
html[data-lang="zh"] .filters { font-family: var(--hand-zh); font-size: 20px; }
.filters button { color: var(--ink-2); }
.filters button sup { font-size: .62em; color: var(--pencil); margin-left: 1px; }
.filters button:hover { color: var(--red); }
.filters button.active { color: var(--red); text-decoration: underline wavy var(--red); text-underline-offset: 6px; text-decoration-thickness: 1.5px; }
.refs { list-style: none; margin: 0; padding: 0; }
.refs li { display: grid; grid-template-columns: 40px minmax(0, 1fr); margin: 0 0 12px; font-size: 16px; line-height: 1.55; }
.refs .n { color: var(--pencil); font-family: var(--hand); font-size: 20px; line-height: 1.3; }
.refs .t { font-style: italic; }
.refs a { word-break: break-word; }
.stamp { display: inline-block; font-family: var(--hand); font-size: 18px; color: var(--red); border: 1.5px solid var(--red); border-radius: 3px; padding: 0 6px; line-height: 1.25; transform: rotate(-4deg); margin-left: 6px; white-space: nowrap; }
.pencil-tag { font-family: var(--hand); font-size: 19px; color: var(--pencil); margin-left: 6px; white-space: nowrap; }
.refs-group { font-family: var(--hand); font-size: 22px; color: var(--pencil); margin: 18px 0 8px; }
html[data-lang="zh"] .refs-group { font-family: var(--hand-zh); font-size: 20px; }
.refs li[hidden], .refs-group[hidden] { display: none; }
.refs li.flash { animation: flash 1.6s ease; }
@keyframes flash { 0%, 40% { background: var(--hl); } 100% { background: transparent; } }
.empty { font-family: var(--hand); font-size: 22px; color: var(--pencil); }

/* ---------- timeline + lists ---------- */
.plain { list-style: none; margin: 0; padding: 0; }
.plain li { display: grid; grid-template-columns: 150px minmax(0, 1fr); column-gap: 14px; margin: 5px 0; }
.plain .when { font-family: var(--hand); font-size: 21px; color: var(--pencil); line-height: 1.45; }
.plain .what b { font-weight: 600; }
.plain .what span.role { color: var(--ink-2); }
.set { font-style: italic; margin: 4px 0; }
.set .k { font-style: normal; font-family: var(--hand); font-size: 22px; color: var(--pencil); display: inline-block; min-width: 118px; }
html[data-lang="zh"] .set .k { font-family: var(--hand-zh); font-size: 20px; }

/* ---------- notes & photos ---------- */
.notes { list-style: none; margin: 0 0 8px; padding: 0; }
.notes li { margin: 6px 0; }
.notes a { text-decoration: none; }
.notes a:hover .ti { text-decoration: underline; text-decoration-color: var(--red); }
.notes .d { font-family: var(--hand); font-size: 20px; color: var(--pencil); margin-right: 10px; }
.more-link { font-family: var(--hand); font-size: 21px; color: var(--red); text-decoration: none; }
html[data-lang="zh"] .more-link { font-family: var(--hand-zh); font-size: 19px; }
.more-link:hover { text-decoration: underline; }
.polaroids { display: flex; flex-wrap: wrap; gap: 22px; padding: 16px 4px 10px; }
.pola { position: relative; margin: 0; background: var(--polaroid); padding: 9px 9px 36px; width: 180px; box-shadow: 0 1px 2px rgba(0,0,0,.18), 0 8px 18px -10px rgba(0,0,0,.35); text-decoration: none; display: block; }
.pola:nth-child(3n+1) { transform: rotate(-3deg); }
.pola:nth-child(3n+2) { transform: rotate(2deg); margin-top: 12px; }
.pola:nth-child(3n) { transform: rotate(-1.5deg); }
.pola img { display: block; width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
.pola .cap { position: absolute; left: 6px; right: 6px; bottom: 5px; text-align: center; font-family: var(--hand); font-size: 20px; color: #2b2b2b; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.pola::before { content: ""; position: absolute; top: -12px; left: 50%; width: 80px; height: 22px; margin-left: -40px; background: var(--tape); transform: rotate(-2deg); }
.visitors-map { margin-top: 8px; width: min(100%, 280px); }
.wide { grid-column: 2 / 4; }

/* ---------- footer ---------- */
footer.row { margin-top: 72px; }
.sign { font-family: var(--hand); font-size: 26px; margin: 0 0 6px; }
html[data-lang="zh"] .sign { font-family: var(--hand-zh); font-size: 24px; }
.copy { font-family: var(--hand); font-size: 20px; color: var(--pencil); margin-left: 6px; }
.copy:hover { color: var(--red); }
.updated { font-family: var(--hand); font-size: 19px; color: var(--pencil); }

.toast {
  position: fixed; left: 50%; bottom: 24px; z-index: 70; transform: translate(-50%, 10px) rotate(-1deg);
  background: #fff6a8; color: #2b2b2b; font-family: var(--hand); font-size: 22px; padding: 6px 16px;
  box-shadow: 0 6px 16px -8px rgba(0,0,0,.4); opacity: 0; transition: opacity .2s, transform .2s; pointer-events: none;
}
html[data-lang="zh"] .toast { font-family: var(--hand-zh); font-size: 20px; }
.toast.show { opacity: 1; transform: translate(-50%, 0) rotate(-1deg); }

/* =========================================================
   Sub-pages
   ========================================================= */
.page-title { font-family: var(--serif); font-style: italic; font-weight: 400; font-size: clamp(40px, 6vw, 58px); line-height: 1.1; margin: 22px 0 8px; }
.page-sub { color: var(--ink-2); margin: 0 0 18px; }
.state-msg { font-family: var(--hand); font-size: 22px; color: var(--pencil); }
html[data-lang="zh"] .state-msg { font-family: var(--hand-zh); font-size: 20px; }
.state-msg code { font-family: var(--mono); font-size: 14px; color: var(--ink); }

.search { display: flex; align-items: baseline; gap: 10px; max-width: 420px; border-bottom: 1.5px solid var(--line); margin: 8px 0 14px; }
.search .pfx { font-family: var(--hand); font-size: 22px; color: var(--pencil); }
html[data-lang="zh"] .search .pfx { font-family: var(--hand-zh); font-size: 20px; }
.search input { flex: 1; min-width: 0; border: 0; outline: 0; background: transparent; color: var(--ink); font: inherit; padding: 4px 0; }
.tag-row { display: flex; flex-wrap: wrap; gap: 2px 14px; margin: 0 0 20px; font-family: var(--hand); font-size: 21px; }
html[data-lang="zh"] .tag-row { font-family: var(--hand-zh); font-size: 19px; }
.chip { color: var(--ink-2); }
.chip i { font-style: normal; font-size: .7em; color: var(--pencil); vertical-align: super; margin-left: 1px; }
.chip:hover { color: var(--red); }
.chip.active { color: var(--red); text-decoration: underline wavy var(--red); text-underline-offset: 6px; text-decoration-thickness: 1.5px; }

/* blog list */
.post-list { list-style: none; margin: 0; padding: 0; }
.post-item { margin: 0 0 22px; }
.post-item a { display: block; text-decoration: none; }
.post-item time { font-family: var(--hand); font-size: 21px; color: var(--pencil); }
.post-item .ti { display: block; font-size: 22px; font-weight: 600; line-height: 1.35; margin: 2px 0 4px; }
.post-item a:hover .ti { text-decoration: underline; text-decoration-color: var(--red); }
.post-item .su { display: block; color: var(--ink-2); font-size: 16px; }
.post-item .tg { display: block; font-family: var(--hand); font-size: 19px; color: var(--red); margin-top: 2px; }

/* article */
.back-link { font-family: var(--hand); font-size: 22px; color: var(--pencil); text-decoration: none; }
html[data-lang="zh"] .back-link { font-family: var(--hand-zh); font-size: 20px; }
.back-link:hover { color: var(--red); }
.article-title { font-family: var(--serif); font-weight: 600; font-size: clamp(30px, 4.4vw, 42px); line-height: 1.2; margin: 14px 0 6px; }
.article-meta { display: flex; flex-wrap: wrap; gap: 0 14px; font-family: var(--hand); font-size: 21px; color: var(--pencil); }
.toc-side { position: sticky; top: 20px; }
.toc-side h4 { margin: 0 0 6px; font-family: var(--hand); font-size: 23px; font-weight: 500; color: var(--red); }
html[data-lang="zh"] .toc-side h4 { font-family: var(--hand-zh); font-size: 21px; font-weight: 400; }
.toc-side ol { list-style: none; margin: 0; padding: 0; }
.toc-side a { display: block; font-size: 15px; line-height: 1.45; color: var(--ink-2); text-decoration: none; padding: 3px 0; }
.toc-side a:hover { color: var(--red); }
.toc-side a.active { color: var(--red); }
.toc-side a.active::before { content: "→ "; }
.toc-side .lvl-3 a { padding-left: 14px; font-size: 14px; }
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 44px; padding-top: 14px; border-top: 1.5px dashed var(--line); }
.pager a { text-decoration: none; }
.pager small { display: block; font-family: var(--hand); font-size: 20px; color: var(--pencil); }
.pager span { font-weight: 600; }
.pager a:hover span { color: var(--red); }
.pager .next { text-align: right; grid-column: 2; }

/* prose */
.prose { margin-top: 26px; }
.prose > :first-child { margin-top: 0; }
.prose h2 { font-size: 32px; margin: 42px 0 10px; scroll-margin-top: 20px; }
.prose h3 { font-family: var(--hand); font-size: 26px; font-weight: 700; margin: 30px 0 8px; scroll-margin-top: 20px; }
html[data-lang="zh"] .prose h3 { font-family: var(--hand-zh); font-weight: 400; font-size: 24px; }
.prose h4 { font-size: 18px; margin: 24px 0 6px; }
.prose a { color: var(--red); }
.prose ul, .prose ol { padding-left: 1.4em; margin: 0 0 14px; }
.prose li { margin: 4px 0; }
.prose li::marker { color: var(--red); }
.prose blockquote { margin: 18px 0; padding: 4px 0 4px 16px; border-left: 2px solid var(--red); color: var(--ink-2); font-style: italic; }
.prose blockquote p:last-child { margin: 0; }
.prose hr { border: 0; border-top: 1.5px dashed var(--line); margin: 30px 0; }
.prose img { max-width: 100%; }
.prose :not(pre) > code { font-family: var(--mono); font-size: .84em; padding: .1em .35em; background: var(--code-bg); border: 1px solid var(--line); border-radius: 3px; }
.prose .table-wrap { overflow-x: auto; margin: 18px 0; }
.prose table { border-collapse: collapse; font-size: 16px; }
.prose th, .prose td { text-align: left; padding: 6px 18px 6px 0; border-bottom: 1px solid var(--line); vertical-align: top; }
.prose th { font-family: var(--hand); font-size: 20px; font-weight: 500; color: var(--pencil); }
.code-block { position: relative; margin: 18px 0; }
.code-block pre {
  margin: 0; padding: 30px 18px 16px; overflow-x: auto; background: var(--code-bg); border: 1px solid var(--line); border-radius: 4px;
  font-family: var(--mono); font-size: 13.5px; line-height: 1.65; tab-size: 4; font-variant-ligatures: none;
}
.code-block pre code { font-family: inherit; }
.code-block .code-lang { position: absolute; top: 5px; left: 14px; font-family: var(--hand); font-size: 18px; color: var(--pencil); }
.copy-code { position: absolute; top: 5px; right: 12px; font-family: var(--hand); font-size: 18px; color: var(--pencil); }
.copy-code:hover { color: var(--red); }
.hljs-keyword, .hljs-selector-tag, .hljs-literal { color: #7b3fa0; }
.hljs-string, .hljs-regexp, .hljs-addition { color: #2f7a3b; }
.hljs-number, .hljs-symbol { color: var(--red); }
.hljs-title, .hljs-title.function_, .hljs-title.class_, .hljs-section, .hljs-built_in, .hljs-type { color: #1f5fa8; }
.hljs-comment, .hljs-quote, .hljs-meta { color: var(--pencil); font-style: italic; }
:root[data-theme="dark"] .hljs-keyword { color: #d5b3f0; }
:root[data-theme="dark"] .hljs-string { color: #a9dca0; }
:root[data-theme="dark"] .hljs-title, :root[data-theme="dark"] .hljs-built_in, :root[data-theme="dark"] .hljs-type { color: #9cc7f0; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .hljs-keyword { color: #d5b3f0; }
  :root:not([data-theme="light"]) .hljs-string { color: #a9dca0; }
  :root:not([data-theme="light"]) .hljs-title, :root:not([data-theme="light"]) .hljs-built_in, :root:not([data-theme="light"]) .hljs-type { color: #9cc7f0; }
}

/* gallery */
.justified { display: flex; flex-wrap: wrap; gap: 12px; }
.tile { position: relative; display: block; overflow: hidden; flex: none; cursor: zoom-in; background: var(--polaroid); padding: 6px; box-shadow: 0 1px 2px rgba(0,0,0,.16), 0 6px 14px -8px rgba(0,0,0,.35); text-decoration: none; }
.tile img { width: 100%; height: 100%; object-fit: cover; display: block; opacity: 0; transition: opacity .4s; }
.tile img.loaded { opacity: 1; }
.tile:hover { transform: rotate(-.6deg); }
.tile-cap { position: absolute; left: 6px; right: 6px; bottom: 6px; padding: 18px 10px 6px; display: flex; flex-direction: column; background: linear-gradient(180deg, transparent, rgba(0,0,0,.55)); color: #fff; font-size: 14px; line-height: 1.4; opacity: 0; transition: opacity .2s; }
.tile-cap .cap-main { display: flex; justify-content: space-between; gap: 8px; }
.tile-cap small { opacity: .85; white-space: nowrap; }
.cap-loc, .lb-loc { display: inline-flex; align-items: center; gap: 5px; min-width: 0; }
.cap-loc span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.cap-loc svg, .lb-loc svg { width: 13px; height: 13px; flex-shrink: 0; fill: none; stroke: currentColor; stroke-width: 2; }
.tile:hover .tile-cap, .tile:focus-visible .tile-cap, .tile.has-loc .tile-cap { opacity: 1; }
.tile.has-loc .cap-main { display: none; }
.tile.has-loc:hover .cap-main { display: flex; }
@media (hover: none) { .tile:not(.has-loc) .tile-cap { display: none; } }

.lightbox { position: fixed; inset: 0; z-index: 80; display: grid; grid-template-columns: 80px minmax(0, 1fr) 80px; align-items: center; background: rgba(12, 16, 14, .95); color: #ecebe4; touch-action: pan-y; }
.lightbox[hidden] { display: none; }
.lb-figure { margin: 0; display: flex; flex-direction: column; align-items: center; gap: 10px; min-width: 0; pointer-events: none; }
.lb-figure img { max-width: 100%; max-height: calc(100vh - 150px); max-height: calc(100svh - 150px); background: #fff; padding: 8px; opacity: 0; transition: opacity .25s; pointer-events: auto; }
.lb-figure img.loaded { opacity: 1; }
.lb-figure figcaption { display: flex; flex-direction: column; align-items: center; gap: 2px; text-align: center; font-family: var(--hand); font-size: 22px; padding: 0 12px; }
.lb-figure figcaption .mono { font-family: var(--serif); font-size: 13px; color: #b3b8ad; }
.lb-loc[hidden] { display: none; }
.lb-btn { justify-self: center; font-family: var(--hand); font-size: 24px; color: #b3b8ad; padding: 6px 10px; }
.lb-btn:hover { color: #f4a49a; }
.lb-close { position: absolute; top: 12px; right: 16px; }
.lb-count { position: absolute; top: 18px; left: 20px; font-family: var(--hand); font-size: 20px; color: #b3b8ad; }

/* =========================================================
   Small screens: marginalia fall inline
   ========================================================= */
@media (max-width: 900px) {
  body { font-size: 16.5px; }
  .sheet { padding: 20px 18px 64px; }
  .sheet::before { left: 10px; }
  .row { grid-template-columns: minmax(0, 1fr); }
  .wide { grid-column: auto; }
  .num { text-align: left; font-size: 24px; padding-top: 0; }
  .note { padding: 0 0 8px 14px; border-left: 2px solid var(--margin-line); margin: 4px 0 10px; }
  .cols { grid-template-columns: minmax(0, 1fr); gap: 8px; }
  .fig svg { max-width: 300px; margin: 0 auto; }
  .result { padding: 6px 8px; }
  .plain li { grid-template-columns: minmax(0, 1fr); margin: 8px 0; }
  .set .k { display: block; min-width: 0; }
  .toc-side { display: none; }
  .pager { grid-template-columns: minmax(0, 1fr); }
  .pager .next { grid-column: 1; text-align: left; }
  .polaroids { gap: 16px; }
  .pola { width: calc(50% - 10px); }
  .justified { gap: 8px; }
  .tile { padding: 4px; }
  .lightbox { grid-template-columns: minmax(0, 1fr); padding: 0 8px; }
  .lb-prev, .lb-next { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  .refs li.flash { animation: none; }
  .tile:hover { transform: none; }
}