:root {
  --bg: #f3efe6;
  --paper: #fffaf0;
  --ink: #1b1a17;
  --muted: #645f56;
  --line: #d8cfbf;
  --accent: #0e5a46;
  --accent-soft: #dceee7;
  --shadow: rgba(30, 24, 15, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, #fbf7ed 0, #f3efe6 45%, #ebe5d8 100%);
  line-height: 1.6;
}

a {
  color: var(--accent);
}

code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  background: #f2ebdd;
  padding: 0.1rem 0.3rem;
  border-radius: 4px;
}

.page {
  max-width: 1120px;
  margin: 0 auto;
  padding: 32px 20px 64px;
}

body.docs-mode .page {
  max-width: 1440px;
}

.topbar {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 16px;
}

.lang-switch {
  display: inline-flex;
  gap: 8px;
  padding: 6px;
  background: rgba(255, 250, 240, 0.92);
  border: 1px solid var(--line);
  box-shadow: 0 8px 20px var(--shadow);
}

.lang-switch a {
  text-decoration: none;
  padding: 6px 10px;
  color: var(--muted);
  border: 1px solid transparent;
}

.lang-switch a.active {
  color: var(--ink);
  background: #efe7d7;
  border-color: var(--line);
}

.hero {
  padding: 24px;
  background: var(--paper);
  border: 1px solid var(--line);
  box-shadow: 0 18px 40px var(--shadow);
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 12px;
  color: var(--muted);
  margin: 0 0 8px;
}

h1,
h2,
h3 {
  font-weight: 700;
  line-height: 1.2;
}

h1 {
  margin: 0 0 12px;
  font-size: clamp(2.1rem, 4vw, 3.6rem);
}

.lede {
  max-width: 820px;
  font-size: 1.08rem;
}

.callout {
  margin-top: 20px;
  padding: 16px 18px;
  background: var(--accent-soft);
  border-left: 4px solid var(--accent);
  display: grid;
  gap: 8px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 24px;
}

.card {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 20px;
  box-shadow: 0 10px 24px var(--shadow);
}

.card.wide {
  grid-column: 1 / -1;
}

.chapter {
  max-width: 920px;
  margin: 0 auto;
  background: var(--paper);
  border: 1px solid var(--line);
  box-shadow: 0 18px 40px var(--shadow);
  padding: 28px 28px 40px;
}

.docs-shell {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

.docs-sidebar {
  position: sticky;
  top: 24px;
  align-self: start;
  max-height: calc(100vh - 48px);
  overflow: auto;
  background: rgba(255, 250, 240, 0.96);
  border: 1px solid var(--line);
  box-shadow: 0 18px 40px var(--shadow);
  padding: 18px;
}

.docs-sidebar-brand {
  margin-bottom: 18px;
  font-size: 1.15rem;
  font-weight: 700;
}

.docs-sidebar-brand a {
  text-decoration: none;
}

.docs-nav-group + .docs-nav-group {
  margin-top: 18px;
}

.docs-nav-group h3 {
  margin: 0 0 8px;
  font-size: 0.95rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.docs-nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.docs-nav-list li {
  margin: 0;
}

.docs-nav-list a {
  display: block;
  padding: 8px 10px;
  border-radius: 8px;
  text-decoration: none;
}

.docs-nav-list li.active a,
.docs-nav-list a:hover {
  background: #efe7d7;
}

.docs-content {
  min-width: 0;
}

.docs-content-header {
  display: flex;
  gap: 8px;
  align-items: center;
  color: var(--muted);
  margin-bottom: 12px;
  font-size: 0.95rem;
}

.docs-content .chapter {
  max-width: none;
  margin: 0;
}

.chapter-nav {
  margin-bottom: 18px;
  color: var(--muted);
  font-size: 0.95rem;
}

.chapter h1 {
  font-size: clamp(2rem, 3.8vw, 3rem);
}

.chapter section + section {
  margin-top: 28px;
}

.chapter ul,
.chapter ol {
  padding-left: 20px;
}

.note {
  padding: 14px 16px;
  background: #f4efe4;
  border-left: 4px solid #8d7f62;
}

.source-nav {
  margin-top: 32px;
  padding: 20px;
  background: #f7f1e5;
  border: 1px solid var(--line);
}

.source-nav h2 {
  margin-top: 0;
}

.source-nav-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
}

.source-nav-block {
  background: rgba(255, 250, 240, 0.92);
  border: 1px solid var(--line);
  padding: 14px 16px;
}

.source-nav-block h3 {
  margin-top: 0;
  margin-bottom: 10px;
  font-size: 1rem;
}

.source-nav-block ul {
  margin: 0;
}

.source-study {
  margin-top: 32px;
  padding: 24px;
  background: #f8f4eb;
  border: 1px solid var(--line);
}

.source-study-intro {
  margin-top: 0;
  color: var(--muted);
}

.source-study-card + .source-study-card {
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.source-study-card h3 {
  margin-bottom: 8px;
}

.source-study-meta {
  margin-top: 0;
  color: var(--muted);
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.source-study-copy,
.source-study-meaning {
  margin-top: 12px;
}

.code-excerpt {
  margin: 14px 0;
  padding: 14px;
  background: #201d18;
  color: #efe7d7;
  overflow: auto;
}

.code-line {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 12px;
}

.code-line-no {
  color: #b7aa92;
  text-align: right;
  user-select: none;
}

.code-line-text {
  background: transparent;
  color: inherit;
  padding: 0;
}

.chapter-pager {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 20px;
}

.chapter-pager-card {
  display: block;
  padding: 16px 18px;
  background: var(--paper);
  border: 1px solid var(--line);
  box-shadow: 0 10px 24px var(--shadow);
  text-decoration: none;
}

.chapter-pager-card span {
  display: block;
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 6px;
}

.chapter-pager-card strong {
  color: var(--ink);
}

.table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
}

.table th,
.table td {
  border: 1px solid var(--line);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}

.table th {
  background: #efe7d7;
}

@media (max-width: 700px) {
  .page {
    padding: 20px 14px 40px;
  }

  .hero,
  .chapter,
  .card {
    padding: 18px;
  }

  .docs-shell {
    grid-template-columns: 1fr;
  }

  .docs-sidebar {
    position: static;
    max-height: none;
  }

  .chapter-pager {
    grid-template-columns: 1fr;
  }
}