:root {
    --bg: #fbfaf7;
    --surface: #ffffff;
    --text: #1d1b16;
    --muted: #5f5b50;
    --line: #e7e3d8;
    --red: #da251d;
    --red-ink: #ffffff;
    --yellow: #ffde00;
    --code-bg: #1d1b16;
    --code-text: #f4f1e8;
    --shadow: 0 1px 2px rgba(29,27,22,.06), 0 8px 24px rgba(29,27,22,.06);
  }
  @media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
      --bg: #151410;
      --surface: #1e1c17;
      --text: #f4f1e8;
      --muted: #b0aa9a;
      --line: #34312a;
      --code-bg: #0e0d0a;
      --shadow: 0 1px 2px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.35);
    }
  }
  :root[data-theme="dark"] {
    --bg: #151410; --surface: #1e1c17; --text: #f4f1e8; --muted: #b0aa9a;
    --line: #34312a; --code-bg: #0e0d0a;
    --shadow: 0 1px 2px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.35);
  }
  * { box-sizing: border-box; }
  html { scroll-behavior: smooth; }
  body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font: 17px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", sans-serif;
    letter-spacing: .01em;
    -webkit-font-smoothing: antialiased;
  }
  a { color: inherit; }
  .wrap { max-width: 1040px; margin: 0 auto; padding: 0 16px; }

  header.nav { border-bottom: 1px solid var(--line); background: var(--bg); position: sticky; top: 0; z-index: 5; }
  .nav .wrap { display: flex; align-items: center; justify-content: space-between; height: 60px; gap: 16px; }
  .brand { display: flex; align-items: center; gap: 10px; font-weight: 700; text-decoration: none; }
  .brand img { width: 30px; height: 30px; }
  .nav nav { display: flex; align-items: center; gap: 20px; font-size: 15px; color: var(--muted); }
  .nav nav a { text-decoration: none; }
  .nav nav a:hover { color: var(--text); }
  @media (max-width: 640px) { .nav nav .hide-sm { display: none; } }

  .hero { padding-top: 72px; padding-bottom: 56px; }
  .hero-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 48px; align-items: center; }
  @media (max-width: 860px) { .hero-grid { grid-template-columns: 1fr; gap: 36px; } .hero { padding-top: 44px; } }
  .eyebrow { display: inline-flex; align-items: center; gap: 8px; font-size: 14px; color: var(--muted);
    border: 1px solid var(--line); background: var(--surface); padding: 4px 12px; border-radius: 99px; }
  .eyebrow i { width: 8px; height: 8px; border-radius: 50%; background: var(--red); display: inline-block; }
  h1 { font-size: clamp(36px, 6vw, 58px); line-height: 1.08; margin: 18px 0 16px; letter-spacing: -.02em; }
  h1 em { font-style: normal; color: var(--red); }
  .lead { font-size: 19px; color: var(--muted); max-width: 34em; margin: 0 0 28px; }
  .cta { display: flex; flex-wrap: wrap; gap: 12px; }
  .btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 20px; border-radius: 10px;
    font-weight: 600; text-decoration: none; border: 1px solid var(--line); background: var(--surface); }
  .btn.primary { background: var(--red); color: var(--red-ink); border-color: var(--red); }
  .btn:hover { transform: translateY(-1px); box-shadow: var(--shadow); }
  .meta { margin-top: 18px; font-size: 14px; color: var(--muted); }

  .demo { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow); overflow: hidden; }
  .demo-bar { display: flex; gap: 6px; padding: 12px 14px; border-bottom: 1px solid var(--line); }
  .demo-bar b { width: 10px; height: 10px; border-radius: 50%; background: var(--line); display: block; }
  .demo-body { padding: 8px 18px 18px; }
  .row { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; padding: 12px 0; border-bottom: 1px dashed var(--line); }
  .row:last-child { border-bottom: 0; }
  .keys { font: 15px ui-monospace, "SF Mono", Menlo, Consolas, monospace; color: var(--muted); }
  .out { font-size: 22px; font-weight: 600; }
  .out small { font-size: 13px; font-weight: 400; color: var(--muted); margin-left: 6px; }

  section { padding: 64px 0; }
  section.alt { background: var(--surface); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
  h2 { font-size: clamp(26px, 4vw, 36px); line-height: 1.15; margin: 0 0 10px; letter-spacing: -.01em; }
  .sub { color: var(--muted); margin: 0 0 36px; max-width: 40em; }

  .grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
  @media (max-width: 860px) { .grid { grid-template-columns: repeat(2, 1fr); } }
  @media (max-width: 560px) { .grid { grid-template-columns: 1fr; } }
  .card { background: var(--bg); border: 1px solid var(--line); border-radius: 14px; padding: 20px; }
  section.alt .card { background: var(--bg); }
  .card h3 { margin: 0 0 6px; font-size: 18px; }
  .card p { margin: 0; color: var(--muted); font-size: 15.5px; }
  .tick { display: inline-block; width: 26px; height: 26px; border-radius: 8px; background: var(--yellow); color: #3b3000;
    text-align: center; line-height: 26px; font-weight: 700; margin-bottom: 12px; font-size: 14px; }

  .apps { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 8px; }
  .chip { border: 1px solid var(--line); background: var(--surface); border-radius: 99px; padding: 6px 16px; font-size: 15px; }
  .chip::before { content: "✓ "; color: var(--red); font-weight: 700; }

  .steps { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
  @media (max-width: 760px) { .steps { grid-template-columns: 1fr; } }
  .steps > * { min-width: 0; }
  .step h3 { margin: 0 0 4px; }
  .step p { margin: 0 0 12px; color: var(--muted); font-size: 15.5px; }
  pre { margin: 0; background: var(--code-bg); color: var(--code-text); border-radius: 12px; padding: 16px 104px 16px 18px;
    white-space: pre-wrap; overflow-wrap: anywhere; font: 14px/1.7 ui-monospace, "SF Mono", Menlo, Consolas, monospace; }
  pre .c { color: #9b968a; }
  .note { margin-top: 18px; font-size: 15px; color: var(--muted); }

  .theme { background: var(--surface); color: var(--text); border: 1px solid var(--line); border-radius: 10px;
    width: 38px; height: 34px; cursor: pointer; display: inline-flex; align-items: center; justify-content: center; padding: 0; }
  .theme:hover { box-shadow: var(--shadow); }
  .codewrap { position: relative; }
  .copy { position: absolute; top: 10px; right: 10px; background: transparent; color: var(--code-text);
    border: 1px solid #4a463c; border-radius: 8px; padding: 3px 10px; font-size: 13px; cursor: pointer; opacity: .85; }
  .copy:hover { opacity: 1; border-color: var(--yellow); }
  :focus-visible { outline: 2px solid var(--red); outline-offset: 2px; }

  footer { padding: 36px 0 56px; color: var(--muted); font-size: 15px; }
  footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; }
  footer a { color: var(--muted); }

  .nav nav a.cur { color: var(--text); font-weight: 600; }
  @media (max-width: 760px) { .nav nav { gap: 12px; font-size: 14px; } .nav nav .hide-md { display: none; } }

  .doc { padding: 40px 0 64px; }
  .doc .wrap { max-width: 800px; }
  .doc h1 { font-size: clamp(30px, 5vw, 42px); margin: 6px 0 10px; }
  .doc .lead { margin-bottom: 8px; }
  .doc h2 { font-size: 26px; margin: 48px 0 12px; padding-top: 8px; }
  .doc h3 { font-size: 19px; margin: 30px 0 8px; }
  .doc p, .doc li { color: var(--text); }
  .doc ul, .doc ol { padding-left: 22px; }
  .doc li { margin: 4px 0; }
  .doc code, .note code { font: .88em ui-monospace, "SF Mono", Menlo, Consolas, monospace; background: var(--surface);
    border: 1px solid var(--line); border-radius: 6px; padding: 1px 6px; overflow-wrap: anywhere; }
  .doc pre code { background: none; border: 0; padding: 0; font-size: inherit; }
  .tabs { display: flex; flex-wrap: wrap; gap: 8px; margin: 18px 0 0; }
  .tabs a { text-decoration: none; border: 1px solid var(--line); background: var(--surface); border-radius: 99px;
    padding: 5px 16px; font-size: 15px; color: var(--muted); }
  .tabs a.cur { background: var(--red); border-color: var(--red); color: var(--red-ink); }
  .toc { margin: 24px 0 0; padding: 16px 20px; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; font-size: 15.5px; }
  .toc b { display: block; margin-bottom: 4px; }
  .toc ul { margin: 0; padding-left: 20px; }
  .tablewrap { overflow-x: auto; margin: 14px 0; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }
  table { border-collapse: collapse; width: 100%; font-size: 15.5px; }
  th, td { text-align: left; vertical-align: top; padding: 10px 14px; border-bottom: 1px solid var(--line); }
  tr:last-child td { border-bottom: 0; }
  th { font-size: 14px; color: var(--muted); font-weight: 600; background: var(--bg); }
  td.c, th.c { text-align: center; }
  .callout { margin: 18px 0; padding: 14px 18px; border-left: 4px solid var(--yellow); background: var(--surface);
    border-radius: 0 12px 12px 0; font-size: 15.5px; }
  .doc pre { padding-right: 96px; margin: 14px 0; }

  .brand { white-space: nowrap; }
  table { min-width: 560px; }
  td code, th code { white-space: nowrap; }
  td:first-child { min-width: 120px; }