@layer reset, base, layout, components, utilities;

@layer reset {
  *, *::before, *::after { box-sizing: border-box; }
  html { scroll-behavior: smooth; }
  body, h1, h2, h3, p, figure, blockquote, dl, dd { margin: 0; }
  ul, ol { margin: 0; padding: 0; }
  img, picture { display: block; max-width: 100%; }
  button, input, textarea, select { font: inherit; }
}

@layer base {
  :root {
    color-scheme: dark;
    --ink: #f7f3e8;
    --cream: #f7f3e8;
    --muted: #b9c3d7;
    --dim: #7f8ba4;
    --night: #0c1220;
    --night-soft: #121b2d;
    --panel: #172033;
    --line: #34415a;
    --navy: #172033;
    --acid: #31c991;
    --violet: #a678ff;
    --cyan: #29a9e8;
    --orange: #ff6b6b;
    --content: 1240px;
    --gutter: clamp(1.25rem, 4vw, 4rem);
    --display: "Arial Narrow", "Aptos Display", "Helvetica Neue", Arial, sans-serif;
    --body: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  }

  ::selection { color: var(--night); background: var(--acid); }

  body {
    min-width: 320px;
    min-height: 100vh;
    overflow-x: hidden;
    color: var(--ink);
    background:
      radial-gradient(circle at 82% 8%, rgb(166 120 255 / 16%), transparent 30rem),
      radial-gradient(circle at 12% 34%, rgb(41 169 232 / 10%), transparent 35rem),
      var(--night);
    font-family: var(--body);
    line-height: 1.6;
    text-rendering: optimizeLegibility;
  }

  body::before {
    position: fixed;
    z-index: -1;
    inset: 0;
    content: "";
    pointer-events: none;
    background-image:
      linear-gradient(rgb(247 243 232 / 3.5%) 1px, transparent 1px),
      linear-gradient(90deg, rgb(247 243 232 / 3.5%) 1px, transparent 1px);
    background-size: 48px 48px;
    mask-image: linear-gradient(to bottom, black, transparent 72%);
  }

  a { color: inherit; text-decoration: none; }
  a:hover { color: var(--acid); }
  button { color: inherit; }

  h1, h2, h3 {
    font-family: var(--display);
    font-weight: 800;
    line-height: .95;
    letter-spacing: -.055em;
    text-wrap: balance;
  }

  h1 { font-size: clamp(4rem, 11vw, 10rem); }
  h2 { font-size: clamp(2.75rem, 6vw, 6rem); }
  h3 { font-size: clamp(1.45rem, 2.5vw, 2.35rem); }

  code, pre, kbd { font-family: var(--mono); }
  :focus-visible { outline: 3px solid var(--acid); outline-offset: 4px; }
}

@layer layout {
  .shell { width: min(calc(100% - (2 * var(--gutter))), var(--content)); margin-inline: auto; }
  .site-main { overflow: clip; }
  .section { position: relative; padding-block: clamp(5rem, 11vw, 10rem); }
  .section--tight { padding-block: clamp(3.5rem, 7vw, 6rem); }
  .section--line { border-top: 1px solid var(--line); }

  .section-head {
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(18rem, .65fr);
    gap: clamp(2rem, 7vw, 7rem);
    align-items: end;
    margin-bottom: clamp(3rem, 7vw, 6rem);
  }

  .section-head p { max-width: 42rem; color: var(--muted); font-size: clamp(1rem, 1.5vw, 1.18rem); }
  .grid-2, .grid-3, .grid-4 { overflow: hidden; border-radius: 1.5rem; }
  .grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); }
  .grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); }
  .grid-4 { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); }
}

@layer components {
  .skip-link {
    position: fixed;
    z-index: 100;
    top: .75rem;
    left: .75rem;
    padding: .7rem 1rem;
    color: var(--night);
    background: var(--acid);
    transform: translateY(-180%);
  }
  .skip-link:focus { transform: translateY(0); }

  .site-header {
    position: sticky;
    z-index: 50;
    top: 0;
    border-bottom: 1px solid rgb(255 255 255 / 10%);
    background: rgb(12 18 32 / 84%);
    backdrop-filter: blur(18px);
  }
  .site-header::before { position: absolute; top: 0; right: 0; left: 0; height: 3px; content: ""; background: linear-gradient(90deg, var(--orange) 0 25%, var(--violet) 25% 50%, var(--cyan) 50% 75%, var(--acid) 75%); }

  .nav-wrap { display: flex; min-height: 76px; align-items: center; justify-content: space-between; gap: 2rem; }
  .brand { display: inline-flex; align-items: center; gap: .8rem; color: var(--ink); font-family: var(--mono); font-size: .9rem; font-weight: 700; letter-spacing: .04em; }
  .brand:hover { color: var(--ink); }
  .brand-logo { width: 2.6rem; height: 2.6rem; border-radius: .7rem; box-shadow: 0 8px 24px rgb(41 169 232 / 18%); transform: rotate(-5deg); transition: transform 180ms ease; }
  .brand:hover .brand-logo { transform: rotate(2deg) scale(1.04); }
  .brand span:last-child { color: var(--muted); font-weight: 500; }

  .site-nav { display: flex; align-items: center; gap: clamp(1rem, 2.5vw, 2.25rem); }
  .site-nav a { position: relative; color: var(--muted); font-family: var(--mono); font-size: .75rem; letter-spacing: .06em; text-transform: uppercase; }
  .site-nav a::after { position: absolute; right: 0; bottom: -.55rem; left: 0; height: 2px; content: ""; background: var(--acid); transform: scaleX(0); transform-origin: left; transition: transform 180ms ease; }
  .site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--ink); }
  .site-nav a:hover::after, .site-nav a[aria-current="page"]::after { transform: scaleX(1); }

  .nav-github { display: inline-flex; align-items: center; gap: .55rem; padding: .58rem .8rem; border: 1px solid var(--line); }
  .nav-github::before { content: "↗"; color: var(--acid); }

  .menu-toggle { display: none; width: 2.75rem; height: 2.75rem; border: 1px solid var(--line); background: transparent; cursor: pointer; }
  .menu-toggle span, .menu-toggle::before, .menu-toggle::after { display: block; width: 1.15rem; height: 1px; margin: 4px auto; content: ""; background: currentColor; transition: transform 180ms ease, opacity 180ms ease; }
  .menu-toggle[aria-expanded="true"] span { opacity: 0; }
  .menu-toggle[aria-expanded="true"]::before { transform: translateY(5px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"]::after { transform: translateY(-5px) rotate(-45deg); }

  .hero { position: relative; min-height: calc(100vh - 76px); display: grid; align-items: center; padding-block: clamp(4rem, 8vw, 7rem); }
  .hero::after { position: absolute; right: -14vw; bottom: -25vw; width: 52vw; height: 52vw; content: ""; border: 1px solid rgb(49 201 145 / 30%); border-radius: 50%; box-shadow: 0 0 0 8vw rgb(41 169 232 / 5%), 0 0 0 16vw rgb(166 120 255 / 3%); pointer-events: none; }
  .hero-grid { position: relative; z-index: 1; display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(19rem, .65fr); gap: clamp(3rem, 8vw, 8rem); align-items: center; }
  .eyebrow { display: inline-flex; align-items: center; gap: .65rem; margin-bottom: 1.75rem; color: var(--acid); font-family: var(--mono); font-size: .78rem; letter-spacing: .12em; text-transform: uppercase; }
  .eyebrow::before { width: 2.6rem; height: 1px; content: ""; background: currentColor; }
  .hero h1 { max-width: 9ch; text-transform: uppercase; }
  .hero h1 .outline { color: transparent; -webkit-text-stroke: 1px var(--ink); }
  .hero h1 .acid { color: var(--acid); }
  .hero-copy { max-width: 47rem; margin-top: 2rem; color: var(--muted); font-size: clamp(1.1rem, 2vw, 1.42rem); line-height: 1.55; }

  .hero-actions { display: flex; flex-wrap: wrap; gap: .85rem; margin-top: 2.4rem; }
  .button { display: inline-flex; min-height: 3.35rem; align-items: center; justify-content: center; gap: .7rem; padding: .75rem 1.25rem; border: 1px solid var(--line); font-family: var(--mono); font-size: .8rem; font-weight: 700; letter-spacing: .04em; text-transform: uppercase; transition: transform 180ms ease, border-color 180ms ease, background 180ms ease; }
  .button:hover { color: var(--ink); border-color: var(--acid); transform: translateY(-3px); }
  .button--primary { color: var(--night); border-color: var(--acid); background: var(--acid); box-shadow: 6px 6px 0 var(--violet); border-radius: .8rem; }
  .button--primary:hover { color: var(--night); background: #57d8aa; transform: translate(-2px, -2px); box-shadow: 9px 9px 0 var(--violet); }
  .button .arrow { font-size: 1.1rem; }

  .signal-card { position: relative; min-height: 31rem; overflow: hidden; border: 1px solid var(--line); border-radius: 2.4rem; background: linear-gradient(160deg, #1b2740, #111a2c); box-shadow: 18px 18px 0 rgb(41 169 232 / 10%); transform: rotate(2deg); }
  .signal-card::before { position: absolute; inset: .7rem; content: ""; border: 1px dashed rgb(247 243 232 / 16%); border-radius: 1.8rem; }
  .signal-top { display: flex; align-items: center; justify-content: space-between; padding: 1rem 1.25rem; border-bottom: 1px solid var(--line); color: var(--muted); font-family: var(--mono); font-size: .7rem; text-transform: uppercase; }
  .signal-led { width: .55rem; height: .55rem; border-radius: 50%; background: var(--acid); box-shadow: 0 0 18px var(--acid); }
  .signal-body { position: relative; display: grid; min-height: 25rem; place-items: center; padding: 2rem; overflow: hidden; }
  .signal-orbit { position: absolute; width: 18rem; height: 18rem; border: 4px solid transparent; border-top-color: var(--orange); border-right-color: var(--violet); border-bottom-color: var(--cyan); border-left-color: var(--acid); border-radius: 50%; animation: orbit 16s linear infinite; }
  .signal-orbit::before, .signal-orbit::after { position: absolute; content: ""; border-radius: 50%; }
  .signal-orbit::before { inset: 2.2rem; border: 1px dashed rgb(140 108 255 / 60%); }
  .signal-orbit::after { top: 50%; left: -4px; width: 8px; height: 8px; background: var(--acid); box-shadow: 0 0 16px var(--acid); }
  .signal-logo { position: relative; z-index: 1; width: 10.5rem; height: 10.5rem; border-radius: 2.5rem; box-shadow: 0 24px 70px rgb(12 18 32 / 55%); transform: rotate(-3deg); }
  .signal-data { position: absolute; right: 1.4rem; bottom: 1.2rem; left: 1.4rem; display: flex; justify-content: space-between; color: var(--muted); font-family: var(--mono); font-size: .65rem; }

  .ticker { overflow: hidden; border-block: 1px solid var(--line); background: linear-gradient(90deg, var(--orange), var(--violet), var(--cyan), var(--acid)); color: var(--night); transform: rotate(-1deg) scale(1.02); }
  .ticker-track { display: flex; width: max-content; animation: ticker 28s linear infinite; }
  .ticker span { display: inline-flex; align-items: center; gap: 1.5rem; padding: .7rem 1.5rem; font-family: var(--mono); font-size: .75rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
  .ticker span::after { content: "✦"; }

  .kicker { display: block; margin-bottom: 1rem; color: var(--acid); font-family: var(--mono); font-size: .75rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; }
  .lede { max-width: 50rem; color: var(--muted); font-size: clamp(1.1rem, 2vw, 1.4rem); }
  .accent { color: var(--acid); }
  .violet { color: var(--violet); }

  .feature-card { position: relative; min-height: 22rem; padding: clamp(1.5rem, 4vw, 3rem); overflow: hidden; background: var(--night-soft); }
  .feature-card:hover { background: #171a1b; }
  .feature-index { display: block; margin-bottom: 4rem; color: var(--dim); font-family: var(--mono); font-size: .72rem; }
  .feature-card h3 { max-width: 11ch; margin-bottom: 1.25rem; }
  .feature-card p { max-width: 34rem; color: var(--muted); }
  .feature-card::after { position: absolute; top: 1.5rem; right: 1.5rem; width: .65rem; height: .65rem; content: ""; border: 1px solid var(--acid); transform: rotate(45deg); transition: background 180ms ease, transform 180ms ease; }
  .feature-card:hover::after { background: var(--acid); transform: rotate(135deg); }
  .feature-card--acid { color: var(--night); background: var(--cream); }
  .feature-card--acid:hover { background: #ffffff; }
  .feature-card--acid p, .feature-card--acid .feature-index { color: rgb(12 18 32 / 70%); }
  .feature-card--acid::after { border-color: var(--night); }

  .principle { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: clamp(1.5rem, 5vw, 5rem); align-items: start; padding-block: 2.5rem; border-top: 1px solid var(--line); }
  .principle:last-child { border-bottom: 1px solid var(--line); }
  .principle-num { color: var(--acid); font-family: var(--mono); font-size: .78rem; }
  .principle-copy { display: grid; grid-template-columns: minmax(14rem, .6fr) minmax(0, 1fr); gap: 2rem; }
  .principle-copy h3 { letter-spacing: -.035em; }
  .principle-copy p { max-width: 44rem; color: var(--muted); }

  .terminal { overflow: hidden; border: 1px solid var(--line); border-radius: 1.25rem; background: #09101d; box-shadow: 14px 14px 0 rgb(166 120 255 / 16%); }
  .terminal-head { display: flex; align-items: center; justify-content: space-between; padding: .85rem 1rem; border-bottom: 1px solid var(--line); color: var(--dim); font-family: var(--mono); font-size: .68rem; text-transform: uppercase; }
  .terminal-dots { display: flex; gap: .4rem; }
  .terminal-dots i { width: .5rem; height: .5rem; border-radius: 50%; background: var(--line); }
  .terminal-dots i:first-child { background: var(--orange); }
  .terminal-dots i:nth-child(2) { background: var(--acid); }
  .terminal-body { position: relative; overflow-x: auto; padding: clamp(1.25rem, 3vw, 2rem); }
  .terminal pre { min-width: max-content; color: #d8dbd2; font-size: clamp(.72rem, 1.35vw, .92rem); line-height: 1.85; }
  .terminal .prompt { color: var(--acid); }
  .terminal .comment { color: #6f766d; }
  .copy-button { position: absolute; top: 1rem; right: 1rem; min-width: 5.5rem; padding: .5rem .7rem; border: 1px solid var(--line); color: var(--muted); background: var(--night-soft); font-family: var(--mono); font-size: .66rem; cursor: pointer; text-transform: uppercase; }
  .copy-button:hover, .copy-button[data-state="copied"] { color: var(--night); border-color: var(--acid); background: var(--acid); }
  .copy-button[data-state="error"] { color: var(--ink); border-color: var(--orange); }

  .stats { display: grid; grid-template-columns: repeat(4, 1fr); border-block: 1px solid var(--line); }
  .stat { padding: 2rem clamp(1rem, 3vw, 2.5rem); border-right: 1px solid var(--line); }
  .stat:last-child { border-right: 0; }
  .stat strong { display: block; margin-bottom: .5rem; color: var(--acid); font-family: var(--display); font-size: clamp(2.5rem, 5vw, 5rem); line-height: 1; letter-spacing: -.06em; }
  .stat span { color: var(--muted); font-family: var(--mono); font-size: .7rem; letter-spacing: .06em; text-transform: uppercase; }

  .flow { counter-reset: flow; }
  .flow-step { position: relative; display: grid; grid-template-columns: 7rem minmax(0, .8fr) minmax(0, 1fr); gap: 2rem; padding-block: 3rem; border-top: 1px solid var(--line); counter-increment: flow; }
  .flow-step:last-child { border-bottom: 1px solid var(--line); }
  .flow-step::before { content: "0" counter(flow); color: var(--acid); font-family: var(--mono); font-size: .78rem; }
  .flow-step h3 { max-width: 12ch; }
  .flow-step p { color: var(--muted); }
  .flow-step code { color: var(--cyan); font-size: .85em; }

  .page-hero { position: relative; padding-block: clamp(5rem, 12vw, 10rem) clamp(4rem, 9vw, 7rem); border-bottom: 1px solid var(--line); }
  .page-hero::before { position: absolute; top: 12%; right: 4%; width: min(32vw, 25rem); aspect-ratio: 1; content: ""; border: 6px solid transparent; border-top-color: var(--orange); border-right-color: var(--violet); border-bottom-color: var(--cyan); border-left-color: var(--acid); border-radius: 2.8rem; transform: rotate(12deg); box-shadow: inset 0 0 0 3rem rgb(166 120 255 / 4%); }
  .page-hero h1 { max-width: 10ch; font-size: clamp(4rem, 10vw, 9rem); text-transform: uppercase; }
  .page-hero .lede { margin-top: 2rem; }
  .breadcrumb { display: flex; flex-wrap: wrap; gap: .6rem; margin-bottom: 2rem; color: var(--dim); font-family: var(--mono); font-size: .7rem; text-transform: uppercase; }
  .breadcrumb a { color: var(--muted); }

  .diagram { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border: 1px solid var(--line); background: var(--night-soft); }
  .diagram-node { position: relative; min-height: 18rem; padding: 2rem 1.5rem; border-right: 1px solid var(--line); }
  .diagram-node:last-child { border-right: 0; }
  .diagram-node:not(:last-child)::after { position: absolute; z-index: 2; top: 50%; right: -1rem; display: grid; width: 2rem; height: 2rem; place-items: center; content: "→"; color: var(--night); background: var(--acid); font-family: var(--mono); }
  .diagram-node small { color: var(--acid); font-family: var(--mono); }
  .diagram-node h3 { margin-block: 3.5rem 1rem; font-size: clamp(1.35rem, 2.5vw, 2.1rem); }
  .diagram-node p { color: var(--muted); font-size: .9rem; }

  .matrix { width: 100%; border-collapse: collapse; border: 1px solid var(--line); background: var(--night-soft); }
  .matrix th, .matrix td { padding: 1.25rem; border: 1px solid var(--line); text-align: left; vertical-align: top; }
  .matrix th { color: var(--acid); font-family: var(--mono); font-size: .72rem; letter-spacing: .06em; text-transform: uppercase; }
  .matrix td { color: var(--muted); }
  .matrix td:first-child { color: var(--ink); font-weight: 700; }

  .callout { position: relative; padding: clamp(2rem, 5vw, 4rem); border: 1px solid var(--acid); border-radius: 1.5rem; background: linear-gradient(120deg, rgb(49 201 145 / 12%), transparent 60%); }
  .callout::before { position: absolute; top: -1px; right: -1px; padding: .45rem .7rem; content: "SIGNAL"; color: var(--night); background: var(--acid); font-family: var(--mono); font-size: .65rem; font-weight: 800; }
  .callout p { max-width: 58rem; margin-top: 1.2rem; color: var(--muted); font-size: 1.1rem; }

  .faq { border-top: 1px solid var(--line); }
  .faq details { border-bottom: 1px solid var(--line); }
  .faq summary { display: flex; align-items: center; justify-content: space-between; gap: 2rem; padding-block: 1.6rem; cursor: pointer; font-size: 1.1rem; font-weight: 700; list-style: none; }
  .faq summary::-webkit-details-marker { display: none; }
  .faq summary::after { content: "+"; color: var(--acid); font-family: var(--mono); font-size: 1.4rem; }
  .faq details[open] summary::after { content: "−"; }
  .faq details p { max-width: 52rem; padding: 0 3rem 1.6rem 0; color: var(--muted); }

  .tag-row { display: flex; flex-wrap: wrap; gap: .55rem; margin-top: 1.5rem; }
  .tag { padding: .4rem .62rem; border: 1px solid var(--line); color: var(--muted); font-family: var(--mono); font-size: .67rem; text-transform: uppercase; }

  .cta { position: relative; overflow: hidden; padding-block: clamp(5rem, 10vw, 9rem); color: var(--night); background: linear-gradient(110deg, var(--cream) 0 58%, #dff8ee 100%); }
  .cta::before { position: absolute; top: 0; right: 0; left: 0; height: .65rem; content: ""; background: linear-gradient(90deg, var(--orange) 0 25%, var(--violet) 25% 50%, var(--cyan) 50% 75%, var(--acid) 75%); }
  .cta::after { position: absolute; top: -5rem; right: 5%; width: 18rem; height: 18rem; content: ""; border: 2px solid var(--night); border-radius: 50%; box-shadow: 0 0 0 3rem rgb(10 11 12 / 8%), 0 0 0 6rem rgb(10 11 12 / 5%); }
  .cta-grid { position: relative; z-index: 1; display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 3rem; align-items: end; }
  .cta h2 { max-width: 10ch; }
  .cta p { max-width: 40rem; margin-top: 1.5rem; color: rgb(10 11 12 / 70%); font-weight: 600; }
  .cta .button { border-color: var(--night); }
  .cta .button:hover { color: var(--acid); background: var(--night); }

  .site-footer { padding-block: 3rem; border-top: 1px solid var(--line); background: #080e19; }
  .footer-grid { display: grid; grid-template-columns: 1fr auto; gap: 3rem; align-items: end; }
  .footer-brand { font-family: var(--display); font-size: clamp(2.5rem, 6vw, 5rem); font-weight: 900; letter-spacing: -.07em; line-height: 1; text-transform: uppercase; }
  .footer-brand span { color: var(--acid); }
  .footer-links { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 1rem 1.5rem; color: var(--muted); font-family: var(--mono); font-size: .7rem; text-transform: uppercase; }
  .footer-meta { display: flex; justify-content: space-between; gap: 2rem; margin-top: 2.5rem; padding-top: 1.25rem; border-top: 1px solid var(--line); color: var(--dim); font-family: var(--mono); font-size: .64rem; text-transform: uppercase; }

  .reveal { opacity: 1; transform: none; }
  .js .reveal { opacity: 0; transform: translateY(24px); transition: opacity 700ms ease, transform 700ms cubic-bezier(.2, .75, .2, 1); }
  .js .reveal.is-visible { opacity: 1; transform: none; }

  @keyframes orbit { to { transform: rotate(360deg); } }
  @keyframes ticker { to { transform: translateX(-50%); } }
}

@layer utilities {
  .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
  .mono { font-family: var(--mono); }
  .muted { color: var(--muted); }
  .spacer-top { margin-top: clamp(2rem, 5vw, 4rem); }
}

@media (max-width: 980px) {
  .hero-grid, .section-head, .cta-grid { grid-template-columns: 1fr; }
  .hero { min-height: auto; }
  .signal-card { min-height: 25rem; max-width: 34rem; }
  .grid-3, .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(2) { border-right: 0; }
  .stat:nth-child(-n + 2) { border-bottom: 1px solid var(--line); }
  .diagram { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .diagram-node:nth-child(2) { border-right: 0; }
  .diagram-node:nth-child(-n + 2) { border-bottom: 1px solid var(--line); }
  .diagram-node:nth-child(2)::after { display: none; }
}

@media (max-width: 820px) {
  .nav-wrap { flex-wrap: wrap; gap: .75rem 2rem; }
  .site-nav { width: 100%; flex-wrap: wrap; gap: .75rem 1.25rem; padding-bottom: .85rem; }
  .site-nav a::after { display: none; }
  .js .menu-toggle { display: block; }
  .js .site-nav { position: absolute; top: 100%; right: 0; left: 0; display: grid; width: auto; gap: 0; padding: 0 var(--gutter) 1rem; border-bottom: 1px solid var(--line); background: rgb(10 11 12 / 98%); transform: scaleY(0); transform-origin: top; opacity: 0; pointer-events: none; transition: transform 180ms ease, opacity 180ms ease; }
  .js .site-nav[data-open="true"] { transform: scaleY(1); opacity: 1; pointer-events: auto; }
  .js .site-nav a { padding-block: .9rem; border-bottom: 1px solid var(--line); }
  .js .nav-github { margin-top: .65rem; border-bottom: 1px solid var(--line) !important; }
  .principle-copy, .flow-step { grid-template-columns: 1fr; }
  .flow-step { gap: .8rem; }
  .matrix-wrap { overflow-x: auto; }
  .matrix { min-width: 720px; }
}

@media (max-width: 620px) {
  h1 { font-size: clamp(3.4rem, 20vw, 6rem); }
  .brand span:last-child { display: none; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .feature-card { min-height: 18rem; }
  .principle { grid-template-columns: 1fr; gap: .75rem; }
  .stats { grid-template-columns: 1fr; }
  .stat, .stat:nth-child(2) { border-right: 0; border-bottom: 1px solid var(--line); }
  .stat:last-child { border-bottom: 0; }
  .diagram { grid-template-columns: 1fr; }
  .diagram-node, .diagram-node:nth-child(2) { min-height: 14rem; border-right: 0; border-bottom: 1px solid var(--line); }
  .diagram-node:last-child { border-bottom: 0; }
  .diagram-node:not(:last-child)::after { top: auto; right: 1rem; bottom: -1rem; transform: rotate(90deg); }
  .diagram-node:nth-child(2)::after { display: grid; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-links { justify-content: flex-start; }
  .footer-meta { flex-direction: column; gap: .5rem; }
  .page-hero::before { opacity: .45; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .js .reveal { opacity: 1; transform: none; }
}