:root {
    --ground: #0e1117;
    --surface: #161b24;
    --surface-2: #1d2430;
    --line: #29313f;
    --text: #e6e9ef;
    --muted: #8a94a6;
    --faint: #5d6675;
    --accent: #ff8a3d;
    --accent-soft: #ff8a3d24;
    --data: #5bc8ff;
    --good: #57d9a3;

    --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
    --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  }

  @media (prefers-color-scheme: light) {
    :root {
      --ground: #f7f6f4;
      --surface: #ffffff;
      --surface-2: #f1efec;
      --line: #ddd8d1;
      --text: #191c22;
      --muted: #5d6675;
      --faint: #8a94a6;
      --accent: #c25510;
      --accent-soft: #c2551014;
      --data: #0f6f9e;
      --good: #12805c;
    }
  }
  :root[data-theme="light"] {
    --ground: #f7f6f4;
    --surface: #ffffff;
    --surface-2: #f1efec;
    --line: #ddd8d1;
    --text: #191c22;
    --muted: #5d6675;
    --faint: #8a94a6;
    --accent: #c25510;
    --accent-soft: #c2551014;
    --data: #0f6f9e;
    --good: #12805c;
  }
  :root[data-theme="dark"] {
    --ground: #0e1117;
    --surface: #161b24;
    --surface-2: #1d2430;
    --line: #29313f;
    --text: #e6e9ef;
    --muted: #8a94a6;
    --faint: #5d6675;
    --accent: #ff8a3d;
    --accent-soft: #ff8a3d24;
    --data: #5bc8ff;
    --good: #57d9a3;
  }

  * { box-sizing: border-box; }

  body {
    margin: 0;
    background: var(--ground);
    color: var(--text);
    font-family: var(--sans);
    font-size: 16px;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
  }

  .wrap {
    max-width: 860px;
    margin: 0 auto;
    padding: 0 24px;
  }

  /* ── hero ─────────────────────────────────────────────── */

  header {
    padding: 88px 0 56px;
    border-bottom: 1px solid var(--line);
  }

  .eyebrow {
    font-family: var(--mono);
    font-size: 12px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--faint);
    margin: 0 0 22px;
  }

  h1 {
    font-family: var(--mono);
    font-size: clamp(40px, 9vw, 76px);
    line-height: 0.95;
    letter-spacing: -0.045em;
    font-weight: 600;
    margin: 0;
    text-wrap: balance;
  }
  h1 .block { color: var(--accent); }

  .thesis {
    max-width: 60ch;
    font-size: 19px;
    color: var(--muted);
    margin: 24px 0 0;
    text-wrap: pretty;
  }
  .thesis strong { color: var(--text); font-weight: 600; }

  /* ── benchmark ────────────────────────────────────────── */

  .bench {
    margin: 48px 0 0;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 22px 22px 18px;
  }

  .bench-head {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 12px;
    flex-wrap: wrap;
    font-family: var(--mono);
    font-size: 11.5px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--faint);
    margin-bottom: 20px;
  }

  .row {
    display: grid;
    grid-template-columns: 86px 1fr 74px;
    align-items: center;
    gap: 14px;
    padding: 9px 0;
  }
  .row-name { font-family: var(--mono); font-size: 13px; }
  .row-name em { font-style: normal; color: var(--accent); }

  .track {
    height: 10px;
    background: var(--surface-2);
    border-radius: 999px;
    overflow: hidden;
  }
  .bar {
    height: 100%;
    border-radius: 999px;
    width: 0;
    transition: width 1.1s cubic-bezier(.22,.9,.3,1);
  }
  .bar.fast { background: var(--accent); }
  .bar.mid  { background: var(--data); }
  .bar.slow { background: var(--faint); }

  .row-val {
    font-family: var(--mono);
    font-size: 13.5px;
    text-align: right;
    font-variant-numeric: tabular-nums;
    color: var(--muted);
  }
  .row-val b { color: var(--text); font-weight: 600; }

  .bench-note {
    margin: 16px 0 0;
    padding-top: 14px;
    border-top: 1px solid var(--line);
    font-size: 13px;
    color: var(--faint);
  }

  @media (prefers-reduced-motion: reduce) {
    .bar { transition: none; }
  }

  /* ── sections ─────────────────────────────────────────── */

  section { padding: 56px 0; border-bottom: 1px solid var(--line); }

  h2 {
    font-family: var(--mono);
    font-size: 13px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--accent);
    margin: 0 0 8px;
    font-weight: 600;
  }
  .lede {
    font-size: 22px;
    line-height: 1.4;
    letter-spacing: -0.015em;
    margin: 0 0 28px;
    max-width: 34ch;
    text-wrap: balance;
  }
  p { max-width: 65ch; }

  .cards { display: grid; gap: 12px; }
  @media (min-width: 700px) { .cards.three { grid-template-columns: repeat(3, 1fr); } }

  .card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 11px;
    padding: 18px;
  }
  .card.lead { border-color: var(--accent); background: var(--accent-soft); }
  .card h3 {
    font-family: var(--mono);
    font-size: 14px;
    margin: 0 0 6px;
    letter-spacing: -0.01em;
  }
  .card p { margin: 0; font-size: 14px; color: var(--muted); }
  .card .tag {
    display: inline-block;
    font-family: var(--mono);
    font-size: 11px;
    color: var(--faint);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 10px;
  }

  .mods {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 4px;
  }
  .chip {
    font-family: var(--mono);
    font-size: 12.5px;
    padding: 6px 11px;
    border: 1px solid var(--line);
    border-radius: 999px;
    color: var(--muted);
    white-space: nowrap;
  }
  .chip b {
    color: var(--text);
    font-weight: 600;
    font-variant-numeric: tabular-nums;
  }

  ul.plain { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
  ul.plain li { padding-left: 18px; position: relative; max-width: 65ch; }
  ul.plain li::before {
    content: "";
    position: absolute;
    left: 0; top: 10px;
    width: 6px; height: 6px;
    background: var(--accent);
    border-radius: 1px;
  }
  ul.plain b { font-weight: 600; }

  code {
    font-family: var(--mono);
    font-size: 0.9em;
    background: var(--surface-2);
    padding: 2px 6px;
    border-radius: 4px;
  }

  pre {
    font-family: var(--mono);
    font-size: 13px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 16px 18px;
    overflow-x: auto;
    margin: 0;
    line-height: 1.7;
  }
  pre .c { color: var(--faint); }
  pre .k { color: var(--accent); }

  .nav {
    position: sticky;
    top: 0;
    z-index: 10;
    background: color-mix(in srgb, var(--ground) 88%, transparent);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--line);
  }
  .nav-inner {
    max-width: 860px;
    margin: 0 auto;
    padding: 12px 24px;
    display: flex;
    align-items: center;
    gap: 18px;
  }
  .brand {
    font-family: var(--mono);
    font-weight: 600;
    font-size: 14px;
    letter-spacing: -0.02em;
    color: var(--text);
    text-decoration: none;
  }
  .brand span { color: var(--accent); }
  .nav-links { display: none; gap: 20px; margin-left: auto; }
  @media (min-width: 720px) { .nav-links { display: flex; } }
  .nav-links a {
    font-size: 13.5px;
    color: var(--muted);
    text-decoration: none;
  }
  .nav-links a:hover, .nav-links a:focus-visible { color: var(--text); }
  .nav-cta {
    margin-left: auto;
    font-family: var(--mono);
    font-size: 12px;
    letter-spacing: 0.12em;
    padding: 8px 16px;
    border-radius: 7px;
    background: var(--accent);
    color: #12100e;
    font-weight: 600;
    text-decoration: none;
  }
  @media (min-width: 720px) { .nav-cta { margin-left: 0; } }
  .nav-cta:hover, .nav-cta:focus-visible { filter: brightness(1.08); }

  .cta-row { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 30px; }
  .cta {
    font-family: var(--mono);
    font-size: 13px;
    letter-spacing: 0.04em;
    padding: 13px 24px;
    border-radius: 9px;
    background: var(--accent);
    color: #12100e;
    font-weight: 600;
    text-decoration: none;
    border: 1px solid var(--accent);
  }
  .cta:hover, .cta:focus-visible { filter: brightness(1.08); }
  .cta.ghost {
    background: transparent;
    color: var(--text);
    border-color: var(--line);
  }
  .cta.ghost:hover, .cta.ghost:focus-visible { border-color: var(--accent); filter: none; }

  html { scroll-behavior: smooth; }
  @media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
  section[id], #top { scroll-margin-top: 68px; }

  footer {
    padding: 44px 0 72px;
    color: var(--faint);
    font-size: 14px;
    display: flex;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
  }
  footer a { color: var(--muted); text-decoration: none; border-bottom: 1px solid var(--line); }
  footer a:hover, footer a:focus-visible { color: var(--accent); border-color: var(--accent); }
  :focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 3px; }

  .caveat {
    background: var(--surface);
    border: 1px solid var(--line);
    border-left: 2px solid var(--accent);
    border-radius: 0 10px 10px 0;
    padding: 16px 18px;
    font-size: 14.5px;
    color: var(--muted);
    max-width: 65ch;
  }
  .caveat b { color: var(--text); }