:root {
  --bg: #f3f2ee;
  --panel: #fbfaf7;
  --panel-strong: #ffffff;
  --ink: #141414;
  --muted: #616161;
  --line: #d8d4cc;
  --line-strong: #bcb6ab;
  --accent: #111111;
  --soft: #ece8df;
  --danger: #982b2b;
  --ok: #1f5133;
  --shadow: 0 18px 48px rgba(17, 17, 17, 0.06);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.85), transparent 24rem),
    linear-gradient(180deg, rgba(17, 17, 17, 0.02), transparent 18rem),
    var(--bg);
  font-family: "Iowan Old Style", "Palatino Linotype", "Noto Serif SC", "Songti SC", serif;
  line-height: 1.6;
}

a {
  color: inherit;
}

.page {
  width: min(1200px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 24px 0 80px;
}

.hero {
  padding: 20px 0 26px;
  border-bottom: 1px solid var(--line);
}

.hero-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.back-link,
.inline-link,
.section-head a {
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.back-link {
  font-family: "SFMono-Regular", "Menlo", monospace;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.eyebrow,
.section-kicker,
.card-kicker,
.meta-chip span,
.pill strong,
.filter-button,
.nav-rail a,
.mini-kicker,
.detail-list dt {
  font-family: "SFMono-Regular", "Menlo", monospace;
  letter-spacing: 0.06em;
}

.eyebrow,
.section-kicker,
.card-kicker,
.mini-kicker {
  color: var(--muted);
  text-transform: uppercase;
  font-size: 12px;
}

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

h1 {
  margin-top: 14px;
  font-size: clamp(34px, 5vw, 58px);
  line-height: 0.98;
  letter-spacing: -0.04em;
}

h2 {
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.08;
  letter-spacing: -0.03em;
}

h3 {
  font-size: 22px;
  line-height: 1.18;
  letter-spacing: -0.02em;
}

.dek {
  margin-top: 14px;
  max-width: 56rem;
  font-size: 18px;
  color: var(--muted);
}

.hero-meta,
.metric-grid,
.card-grid,
.split-grid,
.artifact-grid,
.summary-grid,
.source-grid,
.lane-grid {
  display: grid;
  gap: 14px;
}

.hero-meta {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: 24px;
}

.meta-chip,
.metric-card,
.card,
.feature-card,
.source-card,
.lane-card,
.artifact-frame,
.detail-panel {
  background: rgba(255, 255, 255, 0.68);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.meta-chip {
  padding: 14px 16px;
}

.meta-chip strong {
  display: block;
  margin-top: 8px;
  font-size: 16px;
  line-height: 1.4;
}

.nav-rail {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  padding: 18px 0 4px;
}

.nav-rail a {
  font-size: 12px;
  text-transform: uppercase;
}

.section {
  padding-top: 28px;
}

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.section-head p {
  max-width: 44rem;
  color: var(--muted);
}

.metric-grid {
  grid-template-columns: repeat(5, minmax(0, 1fr));
  margin-top: 18px;
}

.metric-card {
  padding: 18px;
}

.metric-value {
  font-size: clamp(26px, 4vw, 44px);
  line-height: 1;
  letter-spacing: -0.05em;
}

.metric-label {
  margin-top: 10px;
  font-size: 12px;
  color: var(--muted);
  text-transform: uppercase;
}

.metric-card p {
  margin-top: 10px;
  font-size: 14px;
  color: var(--muted);
}

.summary-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: 18px;
}

.feature-card,
.detail-panel,
.source-card,
.lane-card,
.artifact-frame {
  padding: 18px;
}

.feature-card p,
.detail-panel p,
.source-card p,
.lane-card p,
.artifact-frame p {
  margin-top: 10px;
  color: var(--muted);
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.filter-button {
  appearance: none;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: inherit;
  padding: 8px 12px;
  font-size: 12px;
  text-transform: uppercase;
  cursor: pointer;
}

.filter-button.is-active,
.filter-button:hover {
  background: var(--accent);
  color: #f6f5f1;
}

.card-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 18px;
}

.card {
  min-height: 100%;
}

.clickable-card {
  transition: transform 150ms ease, border-color 150ms ease, box-shadow 150ms ease;
}

.clickable-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
}

.card-link {
  display: block;
  min-height: 100%;
  padding: 18px;
  text-decoration: none;
}

.card-link h3 {
  margin-top: 10px;
}

.card-link p {
  margin-top: 10px;
  color: var(--muted);
}

.card-meta,
.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 8px;
  border: 1px solid var(--line);
  background: var(--panel);
  font-size: 12px;
}

.pill strong {
  color: var(--muted);
  text-transform: uppercase;
  font-size: 10px;
}

.split-grid,
.source-grid {
  grid-template-columns: minmax(0, 1.15fr) minmax(300px, 0.85fr);
  margin-top: 18px;
}

.lane-grid,
.artifact-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 18px;
}

.detail-list {
  display: grid;
  gap: 10px;
}

.detail-list div {
  display: grid;
  gap: 4px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
}

.detail-list div:first-child {
  padding-top: 0;
  border-top: 0;
}

.detail-list dt {
  color: var(--muted);
  text-transform: uppercase;
  font-size: 11px;
}

.detail-list dd {
  margin: 0;
}

.code-block {
  margin: 16px 0 0;
  padding: 18px;
  overflow: auto;
  background: #161616;
  color: #f6f5f1;
  border: 1px solid #2f2f2f;
  white-space: pre-wrap;
  font-family: "SFMono-Regular", "Menlo", monospace;
  font-size: 13px;
  line-height: 1.65;
}

.transcript-block {
  max-height: 32rem;
}

.list {
  margin: 12px 0 0;
  padding-left: 18px;
}

.list li + li {
  margin-top: 8px;
}

.raw-toggle {
  margin-top: 16px;
}

.raw-toggle summary {
  cursor: pointer;
}

.notice {
  margin-top: 18px;
  padding: 16px 18px;
  border-left: 3px solid var(--accent);
  background: rgba(17, 17, 17, 0.04);
}

.mini-stack {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.mini-stack .mini {
  padding: 12px 14px;
  border: 1px solid var(--line);
  background: var(--panel);
}

.footer-note {
  margin-top: 28px;
  color: var(--muted);
  font-size: 14px;
}

[hidden] {
  display: none !important;
}

@media (max-width: 1024px) {
  .hero-meta,
  .metric-grid,
  .summary-grid,
  .card-grid,
  .split-grid,
  .source-grid,
  .lane-grid,
  .artifact-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  .page {
    width: min(100vw - 20px, 1200px);
    padding-top: 16px;
  }

  .hero-meta,
  .metric-grid,
  .summary-grid,
  .card-grid,
  .split-grid,
  .source-grid,
  .lane-grid,
  .artifact-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero {
    padding-top: 8px;
  }

  h1 {
    font-size: 34px;
  }
}