:root {
  --bg: #f4efe6;
  --panel: #fffdf8;
  --panel-strong: #f7f1e7;
  --ink: #1f2520;
  --muted: #5e655d;
  --line: #d8cfbf;
  --accent: #8a4b2e;
  --fact: #295d50;
  --fact-bg: #e6f1ee;
  --compare: #5b4ca7;
  --compare-bg: #ece9fb;
  --advice: #9b6a0c;
  --advice-bg: #fbefcf;
  --shadow: 0 18px 40px rgba(63, 44, 22, 0.08);
  --radius: 22px;
  --radius-sm: 14px;
  --content: 1160px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Noto Sans SC", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(234, 207, 183, 0.55), transparent 34%),
    radial-gradient(circle at top right, rgba(91, 76, 167, 0.08), transparent 26%),
    linear-gradient(180deg, #f9f5ee 0%, var(--bg) 100%);
  line-height: 1.75;
}

a {
  color: inherit;
  text-decoration: none;
}

main {
  width: min(calc(100% - 32px), var(--content));
  margin: 0 auto;
  padding: 24px 0 64px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(10px);
  background: rgba(244, 239, 230, 0.88);
  border-bottom: 1px solid rgba(138, 75, 46, 0.08);
}

.site-header-inner {
  width: min(calc(100% - 32px), var(--content));
  margin: 0 auto;
  display: flex;
  gap: 18px;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
}

.brand {
  display: flex;
  gap: 14px;
  align-items: center;
}

.brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, #8a4b2e, #c4764b);
  color: white;
  font-weight: 700;
  box-shadow: var(--shadow);
}

.brand-copy strong,
h1,
h2,
h3 {
  font-family: Georgia, "Songti SC", "Times New Roman", serif;
}

.brand-copy small {
  display: block;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.top-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-end;
}

.top-nav a {
  padding: 9px 14px;
  border-radius: 999px;
  border: 1px solid transparent;
  color: var(--muted);
  transition: 0.2s ease;
}

.top-nav a:hover,
.top-nav a.active {
  border-color: var(--line);
  color: var(--ink);
  background: rgba(255, 255, 255, 0.6);
}

.hero {
  margin-top: 28px;
  padding: 28px;
  border-radius: 30px;
  background: linear-gradient(160deg, rgba(255, 252, 245, 0.96), rgba(245, 237, 226, 0.96));
  border: 1px solid rgba(138, 75, 46, 0.12);
  box-shadow: var(--shadow);
}

.hero-grid,
.page-grid {
  display: grid;
  gap: 18px;
}

.hero-grid {
  grid-template-columns: minmax(0, 1.6fr) minmax(300px, 1fr);
}

.page-grid {
  grid-template-columns: minmax(0, 1fr) 280px;
  margin-top: 22px;
  align-items: start;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 700;
}

.hero h1 {
  margin: 14px 0 10px;
  font-size: clamp(34px, 6vw, 56px);
  line-height: 1.1;
}

.hero p {
  color: var(--muted);
  margin: 0;
}

.hero-actions,
.source-actions,
.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.button,
.source-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-radius: 999px;
  padding: 10px 16px;
  border: 1px solid var(--line);
  background: white;
}

.button.primary {
  background: var(--ink);
  color: white;
  border-color: var(--ink);
}

.button.secondary {
  background: rgba(255, 255, 255, 0.65);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.badge.fact {
  color: var(--fact);
  background: var(--fact-bg);
}

.badge.compare {
  color: var(--compare);
  background: var(--compare-bg);
}

.badge.advice {
  color: var(--advice);
  background: var(--advice-bg);
}

.panel,
.card,
.diagram,
.side-panel {
  border-radius: var(--radius);
  background: var(--panel);
  border: 1px solid rgba(116, 95, 70, 0.12);
  box-shadow: var(--shadow);
}

.panel,
.side-panel {
  padding: 24px;
}

.section {
  margin-top: 18px;
}

.section-header {
  margin-bottom: 18px;
}

.section-header h2 {
  margin: 8px 0;
  font-size: clamp(28px, 4vw, 38px);
  line-height: 1.18;
}

.section-header p,
.muted {
  color: var(--muted);
}

.kicker {
  color: var(--accent);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 700;
}

.card-grid,
.repo-grid,
.compare-table,
.flow-row {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.card {
  padding: 18px;
}

.card h3 {
  margin: 0 0 8px;
  font-size: 22px;
}

.bullet-list,
.number-list {
  margin: 0;
  padding-left: 22px;
}

.bullet-list li,
.number-list li {
  margin: 8px 0;
}

.diagram {
  padding: 20px;
  background: linear-gradient(180deg, rgba(255,255,255,0.96), rgba(247, 241, 231, 0.96));
}

.diagram h3 {
  margin: 0 0 6px;
  font-size: 24px;
}

.diagram p {
  margin: 0 0 16px;
  color: var(--muted);
}

.flow-step,
.layer-item,
.decision-node,
.anchor-item {
  position: relative;
  padding: 16px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.84);
  border: 1px solid var(--line);
}

.flow-step::after {
  content: "→";
  position: absolute;
  right: -11px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--accent);
  font-weight: 700;
}

.flow-row .flow-step:last-child::after {
  display: none;
}

.layer-stack,
.decision-tree,
.anchor-list {
  display: grid;
  gap: 12px;
}

.layer-item:nth-child(even) {
  background: rgba(247, 241, 231, 0.88);
}

.flow-step strong,
.layer-item strong,
.decision-node strong,
.side-panel strong,
.anchor-item strong {
  display: block;
  margin-bottom: 6px;
  font-size: 15px;
}

.kind-pill,
.tag {
  display: inline-flex;
  padding: 5px 10px;
  border-radius: 999px;
  background: rgba(138, 75, 46, 0.08);
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
}

.side-panel {
  position: sticky;
  top: 86px;
}

.side-panel a {
  display: block;
  padding: 10px 12px;
  border-radius: 12px;
  color: var(--muted);
}

.side-panel a.active,
.side-panel a:hover {
  background: rgba(138, 75, 46, 0.08);
  color: var(--ink);
}

.repo-card .meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.anchor-path {
  font-family: Consolas, "SFMono-Regular", monospace;
  font-size: 12px;
  color: var(--accent);
}

.source-file {
  margin-top: 14px;
  border: 1px solid rgba(116, 95, 70, 0.12);
  border-radius: 18px;
  overflow: hidden;
  background: #fcfaf5;
}

.source-file header {
  padding: 14px 16px;
  border-bottom: 1px solid rgba(116, 95, 70, 0.12);
  background: rgba(255,255,255,0.72);
}

.source-lines {
  max-height: 540px;
  overflow: auto;
  padding: 14px 0;
}

.source-line {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 14px;
  padding: 0 16px;
  font-family: Consolas, "SFMono-Regular", monospace;
  font-size: 13px;
  white-space: pre-wrap;
}

.source-line:target {
  background: rgba(234, 207, 183, 0.45);
}

.line-no {
  color: #9b8d77;
  text-align: right;
  user-select: none;
}

.footer {
  width: min(calc(100% - 32px), var(--content));
  margin: 0 auto 28px;
  padding-top: 18px;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 980px) {
  .hero-grid,
  .page-grid {
    grid-template-columns: 1fr;
  }

  .side-panel {
    position: static;
  }
}

@media (max-width: 700px) {
  .site-header-inner {
    flex-direction: column;
    align-items: stretch;
  }

  .top-nav {
    justify-content: flex-start;
  }

  main {
    width: min(calc(100% - 20px), var(--content));
  }

  .hero,
  .panel,
  .side-panel {
    padding: 18px;
  }

  .flow-step::after {
    display: none;
  }
}