:root {
    --accent: #2563EB;
    --accent-weak: #E7EEFD;
    --ink: #0B1220;
    --body: #26303F;
    --muted: #5B6676;
    --faint: #8892A0;
    --paper: #FFFFFF;
    --sub: #F6F8FC;
    --sub2: #EEF2F8;
    --border: #E1E7F0;
    --border-strong: #CBD4E1;
    --code-bg: #0E1626;
    --code-fg: #D7E1F2;
    --up: #16A34A;
    --warn: #C2740A;
    --down: #DC2626;
    --shadow: 0 1px 2px rgba(11,18,32,.06), 0 8px 24px rgba(11,18,32,.05);
    --radius: 10px;
    --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
    --measure: 74ch;
  }
  @media (prefers-color-scheme: dark) {
    :root {
      --accent: #5B93F6;
      --accent-weak: #17233B;
      --ink: #EAF0FA;
      --body: #C4CDDB;
      --muted: #93A0B2;
      --faint: #6C7A8D;
      --paper: #0B1220;
      --sub: #0F1826;
      --sub2: #131E2F;
      --border: #223047;
      --border-strong: #2E3F5A;
      --code-bg: #060B14;
      --code-fg: #C9D6EC;
      --up: #4ADE80;
      --warn: #F5B454;
      --down: #F87171;
      --shadow: 0 1px 2px rgba(0,0,0,.4), 0 10px 30px rgba(0,0,0,.35);
    }
  }
  :root[data-theme="light"] {
    --accent: #2563EB; --accent-weak: #E7EEFD; --ink: #0B1220; --body: #26303F;
    --muted: #5B6676; --faint: #8892A0; --paper: #FFFFFF; --sub: #F6F8FC; --sub2: #EEF2F8;
    --border: #E1E7F0; --border-strong: #CBD4E1; --code-bg: #0E1626; --code-fg: #D7E1F2;
    --up: #16A34A; --warn: #C2740A; --down: #DC2626; --shadow: 0 1px 2px rgba(11,18,32,.06), 0 8px 24px rgba(11,18,32,.05);
  }
  :root[data-theme="dark"] {
    --accent: #5B93F6; --accent-weak: #17233B; --ink: #EAF0FA; --body: #C4CDDB;
    --muted: #93A0B2; --faint: #6C7A8D; --paper: #0B1220; --sub: #0F1826; --sub2: #131E2F;
    --border: #223047; --border-strong: #2E3F5A; --code-bg: #060B14; --code-fg: #C9D6EC;
    --up: #4ADE80; --warn: #F5B454; --down: #F87171; --shadow: 0 1px 2px rgba(0,0,0,.4), 0 10px 30px rgba(0,0,0,.35);
  }

  * { box-sizing: border-box; }
  body { margin: 0; background: var(--paper); color: var(--body); font-family: var(--sans);
    font-size: 16px; line-height: 1.65; -webkit-font-smoothing: antialiased; }
  a { color: var(--accent); text-decoration: none; }
  a:hover { text-decoration: underline; }
  :focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

  .layout { display: grid; grid-template-columns: 288px minmax(0,1fr); }

  /* Sidebar */
  .side { position: sticky; top: 0; height: 100vh; overflow-y: auto; border-right: 1px solid var(--border);
    background: var(--sub); padding: 22px 18px 40px; }
  .brand { display: flex; align-items: center; gap: 11px; padding: 4px 6px 16px; }
  .mark { width: 34px; height: 34px; border-radius: 9px; background: var(--accent);
    display: grid; place-items: center; flex: none; box-shadow: 0 4px 12px color-mix(in srgb, var(--accent) 40%, transparent); }
  .mark svg { display:block; }
  .brand b { color: var(--ink); font-size: 17px; letter-spacing: -.02em; }
  .brand span { display:block; font-size: 11px; color: var(--faint); letter-spacing: .14em; text-transform: uppercase; font-weight: 600; margin-top: 1px; }
  .filter { width: 100%; margin: 6px 0 14px; padding: 9px 12px; border: 1px solid var(--border-strong);
    border-radius: 8px; background: var(--paper); color: var(--ink); font: inherit; font-size: 14px; }
  .filter::placeholder { color: var(--faint); }
  .nav-group { margin-top: 16px; }
  .nav-group > p { margin: 0 0 6px; padding: 0 8px; font-size: 11px; font-weight: 700; letter-spacing: .12em;
    text-transform: uppercase; color: var(--faint); }
  .side nav a { display: block; padding: 6px 10px; margin: 1px 0; border-radius: 7px; color: var(--muted);
    font-size: 14px; line-height: 1.4; border-left: 2px solid transparent; }
  .side nav a:hover { background: var(--sub2); color: var(--ink); text-decoration: none; }
  .side nav a.active { color: var(--accent); background: var(--accent-weak); font-weight: 600; }

  /* Main */
  main { min-width: 0; }
  .topbar { position: sticky; top: 0; z-index: 20; display: flex; align-items: center; justify-content: space-between;
    gap: 12px; padding: 12px 40px; background: color-mix(in srgb, var(--paper) 86%, transparent);
    backdrop-filter: blur(10px); border-bottom: 1px solid var(--border); }
  .crumbs { font-size: 13px; color: var(--faint); }
  .crumbs b { color: var(--body); font-weight: 600; }
  .tools { display: flex; align-items: center; gap: 8px; }
  .btn { border: 1px solid var(--border-strong); background: var(--paper); color: var(--body); font: inherit;
    font-size: 13px; padding: 6px 11px; border-radius: 8px; cursor: pointer; display:inline-flex; align-items:center; gap:7px; }
  .btn:hover { border-color: var(--accent); color: var(--accent); }
  .hamburger { display: none; }

  .wrap { padding: 0 40px 120px; }
  .content { max-width: 860px; margin: 0 auto; }

  /* Hero */
  .hero { padding: 52px 0 30px; border-bottom: 1px solid var(--border); margin-bottom: 8px; }
  .pulse { height: 26px; margin-bottom: 20px; color: var(--accent); }
  .eyebrow { font-size: 12px; font-weight: 700; letter-spacing: .16em; text-transform: uppercase; color: var(--accent); margin: 0 0 12px; }
  h1 { font-size: 42px; line-height: 1.08; letter-spacing: -.03em; color: var(--ink); margin: 0 0 14px; text-wrap: balance; font-weight: 800; }
  .lede { font-size: 19px; line-height: 1.55; color: var(--muted); max-width: 60ch; margin: 0; }

  section { padding-top: 40px; scroll-margin-top: 72px; }
  h2 { font-size: 27px; letter-spacing: -.02em; color: var(--ink); margin: 8px 0 6px; font-weight: 750; text-wrap: balance;
    padding-top: 20px; border-top: 1px solid var(--border); }
  section.lead h2 { border-top: none; padding-top: 0; }
  h3 { font-size: 18px; letter-spacing: -.01em; color: var(--ink); margin: 30px 0 6px; font-weight: 700; }
  h4 { font-size: 14px; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); margin: 22px 0 4px; font-weight: 700; }
  p { max-width: var(--measure); }
  .sect-note { color: var(--faint); font-size: 14px; margin: 0 0 4px; }

  ul, ol { max-width: var(--measure); padding-left: 22px; }
  li { margin: 5px 0; }
  ol.steps { counter-reset: step; list-style: none; padding-left: 0; margin: 16px 0; }
  ol.steps > li { counter-increment: step; position: relative; padding: 3px 0 14px 44px; margin: 0; }
  ol.steps > li::before { content: counter(step); position: absolute; left: 0; top: 0;
    width: 28px; height: 28px; border-radius: 8px; background: var(--accent-weak); color: var(--accent);
    font-weight: 700; font-size: 14px; font-variant-numeric: tabular-nums; display: grid; place-items: center; font-family: var(--mono); }
  ol.steps > li::after { content: ""; position: absolute; left: 13px; top: 30px; bottom: 2px; width: 2px; background: var(--border); }
  ol.steps > li:last-child::after { display: none; }

  code { font-family: var(--mono); font-size: .88em; background: var(--sub2); color: var(--ink);
    padding: 2px 6px; border-radius: 5px; border: 1px solid var(--border); }
  pre { background: var(--code-bg); color: var(--code-fg); border-radius: var(--radius); padding: 16px 18px;
    overflow-x: auto; font-family: var(--mono); font-size: 13.5px; line-height: 1.6; margin: 14px 0;
    border: 1px solid color-mix(in srgb, var(--code-bg) 60%, var(--border)); }
  pre code { background: none; border: none; padding: 0; color: inherit; font-size: inherit; }
  .cmnt { color: #7C8AA5; }
  .tok { color: #8FD3FF; }

  .callout { border: 1px solid var(--border); border-left-width: 3px; border-radius: 8px; padding: 13px 16px;
    margin: 16px 0; background: var(--sub); font-size: 14.5px; max-width: var(--measure); }
  .callout p { margin: 0; max-width: none; }
  .callout p + p { margin-top: 6px; }
  .callout .lbl { font-weight: 700; letter-spacing: .02em; }
  .callout.note { border-left-color: var(--accent); } .callout.note .lbl { color: var(--accent); }
  .callout.tip { border-left-color: var(--up); } .callout.tip .lbl { color: var(--up); }
  .callout.warn { border-left-color: var(--warn); } .callout.warn .lbl { color: var(--warn); }

  .table-wrap { overflow-x: auto; margin: 16px 0; border: 1px solid var(--border); border-radius: var(--radius); }
  table { border-collapse: collapse; width: 100%; font-size: 14px; }
  th, td { text-align: left; padding: 9px 14px; border-bottom: 1px solid var(--border); vertical-align: top; }
  th { background: var(--sub2); color: var(--ink); font-weight: 650; font-size: 12.5px; text-transform: uppercase; letter-spacing: .04em; white-space: nowrap; }
  tr:last-child td { border-bottom: none; }
  td code { white-space: nowrap; }

  .pill { display: inline-flex; align-items: center; gap: 5px; font-size: 12px; font-weight: 650; padding: 2px 9px;
    border-radius: 999px; font-family: var(--mono); }
  .pill::before { content:""; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
  .pill.up { color: var(--up); background: color-mix(in srgb, var(--up) 14%, transparent); }
  .pill.warn { color: var(--warn); background: color-mix(in srgb, var(--warn) 15%, transparent); }
  .pill.down { color: var(--down); background: color-mix(in srgb, var(--down) 13%, transparent); }

  .cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px,1fr)); gap: 12px; margin: 18px 0; }
  .card { border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; background: var(--sub); }
  .card h5 { margin: 0 0 4px; font-size: 15px; color: var(--ink); }
  .card p { margin: 0; font-size: 13.5px; color: var(--muted); max-width: none; }

  .kbd { font-family: var(--mono); font-size: 12px; border: 1px solid var(--border-strong); border-bottom-width: 2px;
    border-radius: 5px; padding: 1px 6px; background: var(--paper); color: var(--body); }
  footer { border-top: 1px solid var(--border); margin-top: 60px; padding: 26px 0; color: var(--faint); font-size: 13px; }

  @media (max-width: 940px) {
    .layout { grid-template-columns: 1fr; }
    .side { position: fixed; z-index: 40; width: 300px; left: 0; transform: translateX(-102%);
      transition: transform .22s ease; box-shadow: var(--shadow); }
    .side.open { transform: none; }
    .hamburger { display: inline-flex; }
    .topbar, .wrap { padding-left: 20px; padding-right: 20px; }
    h1 { font-size: 33px; }
    .scrim { position: fixed; inset: 0; background: rgba(4,8,16,.4); z-index: 39; opacity: 0; pointer-events: none; transition: opacity .2s; }
    .scrim.show { opacity: 1; pointer-events: auto; }
  }
  @media (prefers-reduced-motion: reduce) { * { animation: none !important; transition: none !important; } }