:root {
  --page-bg: var(--bg);
  --radius: 4px;
  --radius-lg: 6px;
  --pill: 999px;
  --rule-w: 1px;
  --rule-color: var(--line-strong);
  --shell: 1160px;

  --body-weight: 500;
  --label-weight: 700;
  --label-tracking: 0.12em;
  --h1-size: clamp(42px, 6.4vw, 74px);
  --h1-weight: 800;
  --h1-line: 1.02;
  --h1-tracking: -0.025em;
  --h1-a-style: normal;
  --h1-b-style: normal;
  --h1-a: var(--text);
  --h1-b: var(--accent-2);
  --h2-size: clamp(28px, 3.4vw, 38px);
  --h2-weight: 800;
  --h2-tracking: -0.02em;

  --mark-w: 26px;
  --mark-h: 2px;
  --mark-radius: 0;

  --ours-bg: var(--accent);
  --ours-fg: var(--on-accent);
  --ours-sub: rgb(255 255 255 / 0.76);
  --ours-weight: 700;

  --bg-opacity: 1;
  --bg-route: var(--line-strong);
  --bg-shared: var(--line-strong);
  --bg-res-fill: var(--surface);
  --bg-dot: var(--accent-2);
  --bg-pulse: var(--accent-2);

  --font-display: var(--font-ui);
}

* { box-sizing: border-box; }

html { height: 100%; }

body {
  position: relative;
  min-height: 100%;
  margin: 0;
  background: var(--page-bg);
  color: var(--text);
  font-family: var(--font-ui);
  font-weight: var(--body-weight);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  counter-reset: sec;
}

a { color: inherit; }
em { font-style: italic; }
::selection { background: var(--accent); color: var(--on-accent); }

:focus-visible {
  outline: 2px solid var(--accent-2);
  outline-offset: 3px;
  border-radius: 2px;
}

.bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
  pointer-events: none;
  opacity: var(--bg-opacity);
}
.bg-route   { fill: none; stroke: var(--bg-route); stroke-width: 1.2; opacity: 0.5; }
.bg-shared  { fill: none; stroke: var(--bg-shared); stroke-width: 2.2; opacity: 0.85; }
.bg-res     { fill: var(--bg-res-fill); stroke: var(--bg-shared); stroke-width: 1.1; opacity: 0.9; }
.bg-res-dot { fill: var(--bg-shared); opacity: 0.9; }
.bg-pulse   { fill: none; stroke: var(--bg-pulse); stroke-width: 1.5; }
.bg-dot     { fill: var(--bg-dot); }

.page {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 28px;
}
main { flex: 1; }

.top {
  display: flex;
  align-items: center;
  padding: 24px 0 18px;
  border-bottom: 1px solid var(--line);
}
.mark {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: var(--label-weight);
  letter-spacing: 0.2em;
  white-space: nowrap;
  color: var(--text);
}
a.mark { text-decoration: none; }
.mark-glyph {
  display: block;
  width: 18px;
  height: 20px;
  background: var(--accent-2);
  -webkit-mask: url('../images/mark.svg') center / contain no-repeat;
          mask: url('../images/mark.svg') center / contain no-repeat;
}
.mark svg { display: block; width: 18px; height: 20px; color: var(--accent-2); }

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 740px) 1fr;
  gap: 48px;
  align-items: center;
  padding: 92px 0 72px;
}
.hero-copy { grid-column: 1; grid-row: 1; }

.figure {
  grid-column: 2;
  grid-row: 1;
  justify-self: end;
  width: min(100%, 360px);
}
.figure svg { width: 100%; height: auto; display: block; }
.fig-hex  { fill: none; stroke: var(--line-strong); stroke-width: 1.2; }
.fig-ring { fill: none; stroke: var(--line-strong); stroke-width: 0.8; stroke-dasharray: 2 7; opacity: 0.6; }
.fig-ask  { fill: none; stroke: var(--accent-2); stroke-width: 1.1; opacity: 0.7; }
.fig-node { fill: var(--surface); stroke: var(--line-strong); stroke-width: 1.2; }
.fig-hub  { fill: var(--accent); }

.eyebrow {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 22px;
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: var(--label-weight);
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--accent-2);
}
.eyebrow::before {
  content: '';
  flex: none;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
}

h1 {
  margin: 0 0 26px;
  font-family: var(--font-display);
  font-size: var(--h1-size);
  font-weight: var(--h1-weight);
  line-height: var(--h1-line);
  letter-spacing: var(--h1-tracking);
}
.h1-id { color: var(--h1-a); font-style: var(--h1-a-style); }
.h1-il { color: var(--h1-b); font-style: var(--h1-b-style); }

.lede {
  margin: 0 0 14px;
  max-width: 58ch;
  font-size: 17px;
  line-height: 1.65;
  color: var(--text-2);
}
.lede em { color: var(--text); font-weight: var(--label-weight); font-style: normal; }
.lede + .lede { margin-top: 0; }

.strap {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 28px 0 0;
}
.chip {
  padding: 7px 13px;
  border: 1px solid var(--chip-line, var(--line-strong));
  border-radius: var(--chip-radius, var(--radius));
  background: var(--chip-bg, transparent);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: var(--label-weight);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--chip-fg, var(--text));
}

.layers,
.spec {
  padding: 48px 0 52px;
  border-top: var(--rule-w) solid var(--rule-color);
  counter-increment: sec;
}
.layers-h,
.spec-h {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: var(--h2-size);
  font-weight: var(--h2-weight);
  line-height: 1.1;
  letter-spacing: var(--h2-tracking);
}
.layers-intro,
.spec-intro {
  margin: 0 0 30px;
  max-width: 72ch;
  font-size: 16px;
  line-height: 1.65;
  color: var(--text-2);
}

.layers-list {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--surface);
}
.layers-row {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr) auto;
  gap: 20px;
  align-items: baseline;
  padding: 16px 22px;
}
.layers-row + .layers-row { border-top: 1px solid var(--line); }
.layers-row dt {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: var(--label-weight);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-2);
}
.layers-row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.55;
  color: var(--text-2);
}
.layers-row .layers-owner {
  display: flex;
  gap: 10px;
  align-items: baseline;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
}
.layers-row .layers-owner b { font-weight: var(--label-weight); color: var(--text); }
.layers-ours { background: var(--ours-bg); }
.layers-ours dt { color: var(--ours-fg); }
.layers-ours dd { color: var(--ours-fg); }
.layers-ours .layers-owner { color: var(--ours-sub); }
.layers-ours .layers-owner b { color: var(--ours-strong, var(--ours-fg)); }
.layers-note {
  margin: 18px 0 0;
  max-width: 76ch;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-2);
}

.spec-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--spec-gap, 0);
  margin: 0;
  border-top: var(--spec-top, 1px solid var(--line-strong));
}
.spec-item { padding: 26px 32px 6px 0; }
.spec-item + .spec-item {
  padding-left: 32px;
  border-left: 1px solid var(--line);
}
.spec-item dt {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: var(--h2-weight);
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--text);
}
.spec-role {
  display: block;
  margin-top: 8px;
  font-family: var(--font-ui);
  font-size: 11.5px;
  font-weight: var(--label-weight);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-2);
}
.spec-item dd {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.65;
  color: var(--text-2);
}
.spec-list { margin: 0; padding: 0; list-style: none; }
.spec-list li { position: relative; padding-left: 22px; }
.spec-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.66em;
  width: var(--bullet-w, 10px);
  height: var(--bullet-h, 2px);
  border-radius: var(--bullet-radius, 0);
  background: var(--accent);
}
.spec-list li + li { margin-top: 10px; }
.spec-note {
  margin: 16px 0 0;
}
.spec-note .spec-note-k {
  margin: 0 0 14px;
  font-family: var(--font-ui);
  font-size: 11.5px;
  font-weight: var(--label-weight);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-2);
}
.spec-note p {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.65;
  color: var(--text-2);
}

.status {
  padding: 34px 0 48px;
  border-top: var(--rule-w) solid var(--rule-color);
}
.kicker {
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 9px 15px;
  border: 1px solid var(--chip-line, var(--line-strong));
  border-radius: var(--chip-radius, var(--radius));
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: var(--label-weight);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-2);
}
.kicker::before {
  content: '';
  width: 7px;
  height: 7px;
  border-radius: var(--dot-radius, 50%);
  background: var(--accent);
}

.foot {
  display: flex;
  align-items: center;
  gap: 16px 22px;
  flex-wrap: wrap;
  padding: 24px 0 34px;
  border-top: 1px solid var(--line-strong);
}
.foot-dim {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--faint);
}
.foot-links { margin-left: auto; display: flex; gap: 22px; }
.foot-links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s;
}
.foot-links a:hover,
.foot-links a[aria-current] { color: var(--text); }
.foot-links svg { width: 14px; height: 14px; fill: currentColor; }

.legal { max-width: 72ch; padding: 80px 0 60px; }
.legal-h {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(32px, 4.6vw, 52px);
  font-weight: var(--h1-weight);
  letter-spacing: -0.025em;
  line-height: 1.06;
}
.legal-meta {
  margin: 0 0 30px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
}
.legal-mono { color: var(--accent-2); }
.legal section {
  margin-top: 36px;
  padding-top: 28px;
  border-top: 1px solid var(--line-strong);
}
.legal h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 23px;
  font-weight: var(--h2-weight);
  letter-spacing: -0.015em;
}
.legal p,
.legal li {
  margin: 0 0 12px;
  font-size: 16px;
  line-height: 1.65;
  color: var(--text-2);
}
.legal ul { margin: 0 0 12px; padding-left: 22px; }
.legal li { margin-bottom: 6px; }
.legal li::marker { color: var(--accent-2); }
.legal a { color: var(--accent-2); text-decoration-thickness: 1px; text-underline-offset: 3px; }
.legal-list { margin: 16px 0; }
.legal-row {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}
.legal-row + .legal-row { margin-top: 10px; }
.legal-row dt {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: var(--label-weight);
  letter-spacing: 0.03em;
  color: var(--text);
}
.legal-row dd { margin: 0; font-size: 15px; line-height: 1.65; color: var(--text-2); }

main.err { display: flex; align-items: center; padding: 64px 0 88px; }
.err .kicker { margin-bottom: 24px; }
.err h1 { font-size: clamp(36px, 5.4vw, 62px); margin-bottom: 22px; }
.err .lede { margin-bottom: 32px; }
.go {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 20px;
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  background: var(--accent);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: var(--label-weight);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--on-accent);
  text-decoration: none;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}
.go:hover { background: transparent; color: var(--accent-2); border-color: var(--accent-2); }
.go svg { width: 11px; height: 11px; fill: currentColor; }

@media (max-width: 960px) {
  .hero { grid-template-columns: minmax(0, 1fr); padding-top: 72px; }
  .figure { display: none; }
}
@media (max-width: 760px) {
  .layers-row { grid-template-columns: 1fr; gap: 6px; padding: 14px 16px; }
  .layers-row .layers-owner { flex-wrap: wrap; white-space: normal; }
}
@media (max-width: 720px) {
  .spec-row { grid-template-columns: minmax(0, 1fr); }
  .spec-item { padding: 22px 0 8px; }
  .spec-item + .spec-item { padding-left: 0; border-left: 0; border-top: 1px solid var(--line); }
}
@media (max-width: 640px) {
  .page { padding: 0 20px; }
  .hero { padding: 52px 0 44px; }
  .foot-links { margin-left: 0; width: 100%; }
  .bg { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
  .bg-dot, .bg-pulse { display: none; }
}