:root {
  --paper: #f4efe5;
  --paper-strong: #fffaf0;
  --ink: #172027;
  --muted: #63717b;
  --copper: #b75d32;
  --teal: #1f7478;
  --forest: #24443d;
  --aubergine: #423247;
  --line: rgba(23, 32, 39, 0.14);
  --panel: rgba(255, 251, 242, 0.82);
  --shadow: 0 18px 52px rgba(23, 32, 39, 0.1);
  --sans: "Avenir Next", "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", "Consolas", monospace;
  --ui-corner-radius: 5px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--sans);
  background:
    linear-gradient(rgba(23, 32, 39, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 32, 39, 0.035) 1px, transparent 1px),
    radial-gradient(circle at 84% 8%, rgba(31, 116, 120, 0.16), transparent 30%),
    var(--paper);
  background-size: 32px 32px, 32px 32px, auto, auto;
}

a {
  color: inherit;
}

h1,
h2,
h3,
p {
  margin: 0;
}

code {
  font-family: var(--mono);
}

.docs-shell {
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
  padding: 44px 0 72px;
}

.docs-hero {
  display: grid;
  gap: 20px;
  min-height: min(660px, 82vh);
  align-content: center;
}

.eyebrow,
.section-kicker {
  margin: 0;
  color: var(--copper);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

h1 {
  max-width: 900px;
  font-size: clamp(52px, 10vw, 116px);
  line-height: 0.92;
}

.docs-hero > p {
  max-width: 790px;
  color: var(--muted);
  font-size: clamp(18px, 2.4vw, 24px);
  line-height: 1.55;
}

.docs-actions,
.toc {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.docs-actions a,
.toc a {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  padding: 0 15px;
  border: 1px solid var(--line);
  border-radius: var(--ui-corner-radius);
  text-decoration: none;
  background: rgba(255, 251, 242, 0.74);
}

.docs-actions a:first-child,
.docs-actions a:nth-child(2) {
  color: #fff;
  border-color: transparent;
  background: var(--ink);
}

.quick-start {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--ui-corner-radius);
  box-shadow: var(--shadow);
  background: var(--line);
}

.quick-start div {
  min-height: 210px;
  padding: 24px;
  background: rgba(255, 251, 242, 0.9);
}

.step {
  display: inline-flex;
  margin-bottom: 22px;
  color: var(--teal);
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 800;
}

.quick-start h2,
.doc-section h2,
.references h2 {
  margin-bottom: 14px;
  font-size: clamp(26px, 4vw, 46px);
  line-height: 1.05;
}

.quick-start p,
.doc-section p,
.references p,
.reading-steps,
.route-list p,
.references li {
  color: var(--muted);
  font-size: 16px;
  line-height: 1.7;
}

.toc {
  position: sticky;
  top: 0;
  z-index: 3;
  margin: 26px 0;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--ui-corner-radius);
  backdrop-filter: blur(18px);
  background: rgba(244, 239, 229, 0.86);
}

.toc a {
  min-height: 36px;
  font-size: 14px;
}

.docs-content {
  display: grid;
  gap: 18px;
}

.doc-section,
.references {
  scroll-margin-top: 118px;
  padding: clamp(24px, 5vw, 54px);
  border: 1px solid var(--line);
  border-radius: var(--ui-corner-radius);
  background: var(--panel);
}

.doc-section--lead {
  color: #fff;
  border-color: transparent;
  background:
    linear-gradient(135deg, rgba(23, 32, 39, 0.94), rgba(36, 68, 61, 0.92)),
    var(--ink);
}

.doc-section--lead .section-kicker,
.doc-section--lead h2 {
  color: #ffcc8d;
}

.doc-section--lead p {
  color: rgba(255, 255, 255, 0.78);
}

.reading-steps {
  display: grid;
  gap: 14px;
  margin: 0;
  padding-left: 22px;
}

.reading-steps strong {
  color: var(--ink);
}

.route-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.route-list section {
  min-height: 210px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--ui-corner-radius);
  background: rgba(255, 255, 255, 0.36);
}

.route-list span {
  display: inline-flex;
  margin-bottom: 20px;
  color: var(--copper);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.route-list h3 {
  margin-bottom: 10px;
  font-size: 21px;
}

.signal-strip {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  margin-top: 24px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: var(--ui-corner-radius);
  background: var(--line);
}

.signal-strip span {
  min-height: 86px;
  display: grid;
  place-items: center;
  padding: 12px;
  color: #fff;
  font-family: var(--mono);
  font-size: 13px;
  text-align: center;
  background: var(--forest);
}

.signal-strip span:nth-child(2n) {
  background: var(--aubergine);
}

.references {
  margin-top: 18px;
  background:
    linear-gradient(90deg, rgba(183, 93, 50, 0.1), transparent 42%),
    var(--paper-strong);
}

.references ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.references li {
  min-width: 0;
}

.references a {
  overflow-wrap: anywhere;
  color: var(--teal);
  font-family: var(--mono);
  font-size: 14px;
}

@media (max-width: 860px) {
  .quick-start,
  .route-list,
  .signal-strip,
  .references ul {
    grid-template-columns: 1fr;
  }

  .toc {
    position: static;
  }
}

@media (max-width: 560px) {
  .docs-shell {
    width: min(100% - 24px, 1160px);
    padding-top: 28px;
  }

  .docs-hero {
    min-height: 540px;
  }

  .quick-start div,
  .doc-section,
  .references {
    padding: 20px;
  }
}