GeZsK

<!DOCTYPE html>
<html lang="vi">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">

  <title>ZsK-bot — Engineering Intelligence</title>

  <meta
    name="description"
    content="ZsK-bot — AI engineering intelligence for code review, security analysis and developer workflows."
  >
  <meta name="theme-color" content="#0b0e13">

  
  <link rel="preconnect" href="https://fonts.googleapis.com">
  <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
  <link
    href="https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500;600&family=IBM+Plex+Sans:wght@400;450;500;600;700&display=swap"
    rel="stylesheet"
  >

  <style>
    /* =========================================================
       ZSK-BOT
       Engineering Intelligence
       Single-file GitHub Pages build
    ========================================================= */

    :root {
      --ink: #0b0e13;
      --ink-deep: #080a0e;
      --panel: #12151c;
      --panel-soft: #0f1218;
      --panel-raised: #151922;

      --line: #1e2330;
      --line-bright: #2a3140;

      --text: #e7eaf0;
      --text-soft: #b8bfcc;
      --muted: #8891a6;
      --dim: #596276;

      --signal: #4fe0c4;
      --signal-soft: rgba(79, 224, 196, 0.10);
      --signal-line: rgba(79, 224, 196, 0.30);

      --warn: #f5a623;
      --danger: #ff6b6b;

      --max: 1240px;
      --header: 72px;

      --sans: "IBM Plex Sans", sans-serif;
      --mono: "IBM Plex Mono", monospace;
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
      background: var(--ink);
    }

    body {
      margin: 0;
      min-width: 320px;
      background:
        radial-gradient(
          circle at 75% -10%,
          rgba(79, 224, 196, 0.055),
          transparent 30%
        ),
        var(--ink);
      color: var(--text);
      font-family: var(--sans);
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    body.menu-open {
      overflow: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
    }

    button,
    input {
      font: inherit;
    }

    button {
      color: inherit;
    }

    ::selection {
      background: var(--signal);
      color: #07100e;
    }

    ::-webkit-scrollbar {
      width: 6px;
    }

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

    ::-webkit-scrollbar-thumb {
      background: var(--line-bright);
    }

    /* =========================================================
       ACCESSIBILITY
    ========================================================= */

    :focus-visible {
      outline: 2px solid var(--signal);
      outline-offset: 4px;
    }

    .skip-link {
      position: fixed;
      left: 16px;
      top: -80px;
      z-index: 999;
      padding: 10px 14px;
      background: var(--signal);
      color: #07100e;
      font-family: var(--mono);
      font-size: 12px;
      transition: top 0.2s ease;
    }

    .skip-link:focus {
      top: 16px;
    }

    /* =========================================================
       HEADER
    ========================================================= */

    .site-header {
      position: fixed;
      inset: 0 0 auto 0;
      z-index: 100;
      height: var(--header);

      border-bottom: 1px solid rgba(30, 35, 48, 0.82);

      background: rgba(11, 14, 19, 0.82);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
    }

    .header-inner {
      width: min(calc(100% - 40px), var(--max));
      height: 100%;
      margin: auto;

      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 30px;
    }

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      min-width: max-content;
    }

    .brand-symbol {
      position: relative;

      width: 30px;
      height: 30px;

      display: grid;
      place-items: center;

      border: 1px solid var(--line-bright);

      background:
        linear-gradient(
          135deg,
          rgba(79, 224, 196, 0.12),
          transparent 60%
        ),
        var(--panel);
    }

    .brand-symbol::before {
      content: "";
      width: 9px;
      height: 9px;

      border: 2px solid var(--signal);
      border-radius: 50%;
    }

    .brand-symbol::after {
      content: "";
      position: absolute;

      width: 2px;
      height: 12px;

      background: var(--signal);

      transform: rotate(45deg);
    }

    .brand-name {
      font-size: 16px;
      font-weight: 600;
      letter-spacing: -0.02em;
    }

    .brand-name span {
      color: var(--muted);
      font-weight: 400;
    }

    .desktop-nav {
      display: flex;
      align-items: center;
      gap: 28px;

      color: var(--muted);
      font-size: 13px;
    }

    .desktop-nav a {
      position: relative;
      padding: 8px 0;
      transition: color 0.18s ease;
    }

    .desktop-nav a:hover {
      color: var(--text);
    }

    .desktop-nav a::after {
      content: "";
      position: absolute;
      left: 0;
      right: 100%;
      bottom: 2px;
      height: 1px;
      background: var(--signal);

      transition: right 0.2s ease;
    }

    .desktop-nav a:hover::after {
      right: 0;
    }

    .header-status {
      display: flex;
      align-items: center;
      gap: 9px;

      color: var(--muted);
      font-family: var(--mono);
      font-size: 10px;
      white-space: nowrap;
    }

    .status-dot {
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background: var(--signal);
      box-shadow: 0 0 0 4px rgba(79, 224, 196, 0.07);
    }

    .mobile-menu-button {
      display: none;

      width: 38px;
      height: 38px;

      border: 1px solid var(--line);
      background: transparent;

      cursor: pointer;
    }

    .mobile-menu-button span,
    .mobile-menu-button span::before,
    .mobile-menu-button span::after {
      display: block;
      width: 16px;
      height: 1px;
      background: var(--text);
      margin: auto;

      transition: transform 0.2s ease;
    }

    .mobile-menu-button span::before,
    .mobile-menu-button span::after {
      content: "";
      position: relative;
    }

    .mobile-menu-button span::before {
      top: -5px;
    }

    .mobile-menu-button span::after {
      top: 4px;
    }

    /* =========================================================
       MOBILE NAV
    ========================================================= */

    .mobile-nav {
      position: fixed;
      inset: var(--header) 0 0 0;
      z-index: 90;

      display: none;

      padding: 28px 20px;

      background: var(--ink);

      border-bottom: 1px solid var(--line);
    }

    .mobile-nav.active {
      display: block;
    }

    .mobile-nav a {
      display: block;
      padding: 17px 0;

      border-bottom: 1px solid var(--line);

      color: var(--text-soft);
      font-size: 18px;
    }

    .mobile-nav .mobile-nav-meta {
      margin-top: 30px;

      color: var(--dim);
      font-family: var(--mono);
      font-size: 10px;
      line-height: 1.8;
    }

    /* =========================================================
       GLOBAL
    ========================================================= */

    .container {
      width: min(calc(100% - 40px), var(--max));
      margin: auto;
    }

    .section {
      position: relative;
      padding: 120px 0;
    }

    .eyebrow {
      display: flex;
      align-items: center;
      gap: 10px;

      margin-bottom: 20px;

      color: var(--signal);
      font-family: var(--mono);
      font-size: 10px;
      font-weight: 500;
      letter-spacing: 0.12em;
      text-transform: uppercase;
    }

    .eyebrow-line {
      width: 26px;
      height: 1px;
      background: var(--signal);
    }

    .section-title {
      margin: 0;

      color: var(--text);
      font-size: clamp(32px, 5vw, 58px);
      font-weight: 600;
      letter-spacing: -0.045em;
      line-height: 1.02;
    }

    .section-copy {
      max-width: 620px;

      margin: 22px 0 0;

      color: var(--muted);
      font-size: 16px;
      line-height: 1.75;
    }

    .mono {
      font-family: var(--mono);
    }

    .signal {
      color: var(--signal);
    }

    /* =========================================================
       HERO
    ========================================================= */

    .hero {
      min-height: 100vh;
      padding-top: calc(var(--header) + 80px);
      padding-bottom: 90px;

      display: flex;
      align-items: center;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: minmax(0, 1.05fr) minmax(380px, 0.95fr);
      gap: 70px;
      align-items: center;
    }

    .hero-kicker {
      display: inline-flex;
      align-items: center;
      gap: 10px;

      margin-bottom: 25px;

      color: var(--muted);
      font-family: var(--mono);
      font-size: 11px;
    }

    .hero-kicker strong {
      color: var(--signal);
      font-weight: 500;
    }

    .hero-title {
      max-width: 760px;

      margin: 0;

      font-size: clamp(54px, 7vw, 92px);
      font-weight: 600;
      letter-spacing: -0.065em;
      line-height: 0.94;
    }

    .hero-title .muted-word {
      color: #687184;
    }

    .hero-description {
      max-width: 610px;

      margin: 30px 0 0;

      color: var(--muted);
      font-size: 17px;
      line-height: 1.7;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;

      margin-top: 36px;
    }

    .button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 10px;

      min-height: 44px;
      padding: 0 18px;

      border: 1px solid var(--line-bright);

      background: var(--panel);

      color: var(--text);

      font-size: 13px;
      font-weight: 500;

      cursor: pointer;

      transition:
        background 0.18s ease,
        border-color 0.18s ease,
        transform 0.18s ease;
    }

    .button:hover {
      background: var(--panel-raised);
      border-color: #3a4353;
      transform: translateY(-1px);
    }

    .button-primary {
      border-color: var(--signal);
      background: var(--signal);
      color: #07100e;
    }

    .button-primary:hover {
      border-color: var(--signal);
      background: #68e8cf;
    }

    .button-arrow {
      font-family: var(--mono);
      font-size: 12px;
    }

    /* =========================================================
       HERO REVIEW TERMINAL
    ========================================================= */

    .review-window {
      position: relative;

      border: 1px solid var(--line);

      background: var(--panel);

      box-shadow:
        0 30px 80px rgba(0, 0, 0, 0.35),
        0 0 0 1px rgba(255, 255, 255, 0.01);
    }

    .review-window::before {
      content: "";

      position: absolute;
      top: -1px;
      left: 18px;
      right: 18px;

      height: 1px;

      background: linear-gradient(
        90deg,
        transparent,
        var(--signal),
        transparent
      );

      opacity: 0.7;
    }

    .window-top {
      height: 46px;

      display: flex;
      align-items: center;
      justify-content: space-between;

      padding: 0 15px;

      border-bottom: 1px solid var(--line);
    }

    .window-file {
      color: var(--muted);
      font-family: var(--mono);
      font-size: 10px;
    }

    .window-status {
      display: flex;
      align-items: center;
      gap: 7px;

      color: var(--signal);
      font-family: var(--mono);
      font-size: 9px;
    }

    .window-status .status-dot {
      width: 5px;
      height: 5px;
    }

    .review-body {
      padding: 22px 0 0;
    }

    .review-file-header {
      display: flex;
      justify-content: space-between;
      gap: 15px;

      padding: 0 20px 17px;

      color: var(--text-soft);
      font-family: var(--mono);
      font-size: 11px;
    }

    .review-file-header span:last-child {
      color: var(--dim);
    }

    .diff {
      border-top: 1px solid var(--line);
      border-bottom: 1px solid var(--line);

      font-family: var(--mono);
      font-size: 11px;
      line-height: 1.9;
    }

    .diff-line {
      display: grid;
      grid-template-columns: 34px 22px 1fr;

      padding-right: 16px;

      min-height: 22px;
    }

    .diff-line-number {
      padding-right: 7px;

      text-align: right;

      color: #414958;
      user-select: none;
    }

    .diff-sign {
      color: var(--dim);
    }

    .diff-code {
      white-space: pre-wrap;
      overflow-wrap: anywhere;
    }

    .diff-add {
      background: rgba(79, 224, 196, 0.045);
    }

    .diff-add .diff-sign {
      color: var(--signal);
    }

    .diff-add .diff-code {
      color: #d3e9e4;
    }

    .diff-comment {
      margin: 17px 20px 20px;

      border-left: 2px solid var(--warn);

      background: rgba(245, 166, 35, 0.055);

      padding: 14px 15px;
    }

    .comment-label {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 15px;

      margin-bottom: 9px;

      color: var(--warn);

      font-family: var(--mono);
      font-size: 9px;
      text-transform: uppercase;
      letter-spacing: 0.08em;
    }

    .comment-title {
      color: var(--text);
      font-size: 12px;
      font-weight: 500;
      line-height: 1.5;
    }

    .comment-text {
      margin: 7px 0 0;

      color: var(--muted);

      font-size: 11px;
      line-height: 1.65;
    }

    .review-footer {
      display: grid;
      grid-template-columns: repeat(3, 1fr);

      border-top: 1px solid var(--line);
    }

    .review-stat {
      padding: 13px 15px;

      border-right: 1px solid var(--line);
    }

    .review-stat:last-child {
      border-right: 0;
    }

    .review-stat-label {
      color: var(--dim);
      font-family: var(--mono);
      font-size: 8px;
      text-transform: uppercase;
    }

    .review-stat-value {
      margin-top: 4px;

      color: var(--text-soft);
      font-family: var(--mono);
      font-size: 11px;
    }

    /* =========================================================
       SIGNAL STRIP
    ========================================================= */

    .signal-strip {
      border-top: 1px solid var(--line);
      border-bottom: 1px solid var(--line);

      background: var(--panel-soft);
    }

    .signal-strip-inner {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
    }

    .signal-item {
      min-height: 104px;

      display: flex;
      flex-direction: column;
      justify-content: center;

      padding: 20px;

      border-right: 1px solid var(--line);
    }

    .signal-item:last-child {
      border-right: 0;
    }

    .signal-value {
      color: var(--text);
      font-family: var(--mono);
      font-size: 18px;
    }

    .signal-label {
      margin-top: 6px;

      color: var(--dim);
      font-size: 11px;
    }

    /* =========================================================
       COMPANY
    ========================================================= */

    .company-layout {
      display: grid;
      grid-template-columns: 0.8fr 1.2fr;
      gap: 100px;
    }

    .company-statement {
      margin: 0;

      font-size: clamp(30px, 4vw, 52px);
      font-weight: 500;
      letter-spacing: -0.045em;
      line-height: 1.08;
    }

    .company-statement span {
      color: var(--signal);
    }

    .company-copy {
      color: var(--muted);
      font-size: 15px;
      line-height: 1.85;
    }

    .company-copy p {
      margin: 0 0 22px;
    }

    .company-rule {
      width: 100%;
      height: 1px;

      margin: 35px 0;

      background: var(--line);
    }

    .company-meta {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .meta-block-label {
      color: var(--dim);
      font-family: var(--mono);
      font-size: 9px;
      text-transform: uppercase;
      letter-spacing: 0.08em;
    }

    .meta-block-value {
      margin-top: 8px;

      color: var(--text-soft);
      font-size: 13px;
    }

    /* =========================================================
       TECHNOLOGY
    ========================================================= */

    .technology {
      border-top: 1px solid var(--line);
      background:
        linear-gradient(
          90deg,
          transparent 0,
          rgba(30, 35, 48, 0.28) 50%,
          transparent 100%
        );
    }

    .technology-header {
      display: flex;
      align-items: end;
      justify-content: space-between;
      gap: 40px;
      margin-bottom: 55px;
    }

    .technology-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      border-top: 1px solid var(--line);
      border-left: 1px solid var(--line);
    }

    .technology-card {
      min-height: 310px;

      padding: 30px;

      border-right: 1px solid var(--line);
      border-bottom: 1px solid var(--line);

      transition:
        background 0.25s ease,
        transform 0.25s ease;
    }

    .technology-card:hover {
      background: rgba(79, 224, 196, 0.025);
    }

    .technology-index {
      color: var(--dim);
      font-family: var(--mono);
      font-size: 9px;
    }

    .technology-icon {
      width: 42px;
      height: 42px;

      display: grid;
      place-items: center;

      margin: 55px 0 25px;

      border: 1px solid var(--line-bright);

      color: var(--signal);
      font-family: var(--mono);
      font-size: 14px;
    }

    .technology-card h3 {
      margin: 0;

      color: var(--text);
      font-size: 18px;
      font-weight: 500;
      letter-spacing: -0.02em;
    }

    .technology-card p {
      max-width: 310px;

      margin: 12px 0 0;

      color: var(--muted);
      font-size: 13px;
      line-height: 1.7;
    }

    /* =========================================================
       ARCHITECTURE
    ========================================================= */

    .architecture-layout {
      display: grid;
      grid-template-columns: 0.7fr 1.3fr;
      gap: 80px;
      align-items: start;
    }

    .architecture-diagram {
      position: relative;

      border: 1px solid var(--line);

      background: var(--panel);

      padding: 40px 35px;
    }

    .architecture-diagram::before {
      content: "SYSTEM PATH";

      position: absolute;
      top: -7px;
      left: 18px;

      padding: 0 7px;

      background: var(--ink);

      color: var(--dim);

      font-family: var(--mono);
      font-size: 8px;
      letter-spacing: 0.1em;
    }

    .architecture-node {
      position: relative;

      min-height: 74px;

      display: flex;
      align-items: center;
      gap: 17px;

      padding: 15px 17px;

      border: 1px solid var(--line-bright);

      background: var(--panel-soft);
    }

    .architecture-node:not(:last-child)::after {
      content: "";

      position: absolute;

      left: 24px;
      bottom: -27px;

      width: 1px;
      height: 26px;

      background: var(--line-bright);
    }

    .architecture-node:not(:last-child)::before {
      content: "";

      position: absolute;

      left: 21px;
      bottom: -30px;

      width: 7px;
      height: 7px;

      border-right: 1px solid var(--signal);
      border-bottom: 1px solid var(--signal);

      transform: rotate(45deg);
    }

    .node-number {
      width: 27px;
      height: 27px;

      display: grid;
      place-items: center;

      border: 1px solid var(--line-bright);

      color: var(--signal);

      font-family: var(--mono);
      font-size: 9px;
    }

    .node-content strong {
      display: block;

      color: var(--text);

      font-size: 12px;
      font-weight: 500;
    }

    .node-content span {
      display: block;

      margin-top: 3px;

> 

      color: var(--dim);

      font-family: var(--mono);
      font-size: 9px;
    }

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