:root {
  --bg: #f6f4ee;
  --surface: #fffdf8;
  --ink: #1c2430;
  --muted: #5c6675;
  --line: #e2ddd0;
  --accent: #0f6e6e;
  --accent-soft: #dcefed;
  --warn-bg: #fbeecb;
  --warn-ink: #7a5a00;
  --mark: #ffe89a;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12161c;
    --surface: #1a2028;
    --ink: #e8e6df;
    --muted: #9aa4b2;
    --line: #2a323d;
    --accent: #5cc8c0;
    --accent-soft: #17373a;
    --warn-bg: #3d3210;
    --warn-ink: #f0d68a;
    --mark: #6b5a14;
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-padding-top: 84px;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
}

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

/* ---------- Header ---------- */

.top-inner,
.searchbar-inner,
.layout,
.foot {
  max-width: 1120px;
  margin: 0 auto;
  padding-left: 16px;
  padding-right: 16px;
}

.top-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  padding-top: 32px;
  padding-bottom: 16px;
}

.brand h1 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.6rem, 4vw, 2.3rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.tagline {
  margin: 6px 0 0;
  color: var(--muted);
  max-width: 60ch;
}

.quicklinks {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 12px 0 0;
  font-size: 0.9rem;
}

.quicklinks-label {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.quicklinks a {
  padding: 4px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--accent);
  text-decoration: none;
}

.quicklinks a:hover {
  background: var(--accent-soft);
}

.controls {
  display: flex;
  gap: 8px;
}

.toggle {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: var(--surface);
}

.toggle button {
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 0.85rem;
  padding: 6px 12px;
  cursor: pointer;
}

.toggle button[aria-pressed="true"] {
  background: var(--accent);
  color: var(--surface);
}

/* ---------- Search bar ---------- */

.searchbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
}

.searchbar-inner {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 10px;
  padding-bottom: 10px;
}

#search {
  flex: 1;
  min-width: 0;
  font: inherit;
  font-size: 1.05rem;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  color: var(--ink);
}

#search:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.count {
  color: var(--muted);
  font-size: 0.85rem;
  white-space: nowrap;
}

/* ---------- Layout ---------- */

.layout {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  gap: 32px;
  padding-top: 24px;
  padding-bottom: 48px;
}

.toc {
  position: sticky;
  top: 76px;
  align-self: start;
  max-height: calc(100vh - 92px);
  overflow-y: auto;
  font-size: 0.9rem;
}

.toc ol {
  list-style: none;
  margin: 0;
  padding: 0;
}

.toc a {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  padding: 5px 8px;
  border-radius: 6px;
  color: var(--ink);
  text-decoration: none;
}

.toc a:hover {
  background: var(--accent-soft);
}

.toc .n {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.toc.letters ol {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.toc.letters a {
  font-family: var(--mono);
  font-weight: 700;
  padding: 4px 9px;
  border: 1px solid var(--line);
}

/* ---------- Sections and entries ---------- */

.section {
  margin-bottom: 48px;
}

.section > h2 {
  margin: 0 0 4px;
  font-family: var(--serif);
  font-size: 1.5rem;
  line-height: 1.2;
}

.section > h2 .num {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.9rem;
  margin-right: 8px;
}

.section-intro {
  margin: 0 0 8px;
  color: var(--muted);
  max-width: 70ch;
}

.section-edit {
  font-size: 0.8rem;
}

.group-title {
  margin: 24px 0 4px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--ink);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.entry {
  display: grid;
  grid-template-columns: 9.5rem minmax(0, 1fr);
  gap: 4px 16px;
  padding: 12px 8px;
  border-bottom: 1px solid var(--line);
  border-radius: 4px;
}

.entry:target,
.entry.flash {
  background: var(--accent-soft);
}

.acr {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 1rem;
  color: var(--accent);
  text-decoration: none;
  overflow-wrap: anywhere;
}

.acr:hover {
  text-decoration: underline;
}

.entry .name {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
}

.entry .parent {
  color: var(--muted);
  font-weight: 400;
}

.entry .desc {
  margin: 2px 0 0;
  color: var(--ink);
}

.entry .meta {
  margin: 4px 0 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 12px;
  font-size: 0.82rem;
  color: var(--muted);
}

.badge {
  display: inline-block;
  padding: 1px 8px;
  border-radius: 999px;
  background: var(--warn-bg);
  color: var(--warn-ink);
  font-size: 0.75rem;
}

.where {
  display: inline-block;
  padding: 1px 8px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--ink);
  font-size: 0.75rem;
}

mark {
  background: var(--mark);
  color: inherit;
  border-radius: 2px;
}

.empty {
  padding: 48px 0;
  color: var(--muted);
  text-align: center;
}

/* ---------- Back to top ---------- */

.to-top {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 20;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border: 0;
  border-radius: 50%;
  background: var(--accent);
  color: var(--surface);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.25);
  cursor: pointer;
}

.to-top[hidden] {
  display: none;
}

.to-top:hover {
  filter: brightness(1.1);
}

.to-top:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}

/* ---------- Footer ---------- */

.foot {
  border-top: 1px solid var(--line);
  padding-top: 20px;
  padding-bottom: 40px;
  color: var(--muted);
  font-size: 0.85rem;
}

.foot p {
  margin: 0 0 6px;
  max-width: 80ch;
}

/* ---------- Mobile ---------- */

@media (max-width: 800px) {
  .layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
    padding-top: 12px;
  }

  .toc {
    position: static;
    max-height: none;
    overflow-x: auto;
  }

  .toc ol {
    display: flex;
    gap: 6px;
    padding-bottom: 6px;
  }

  .toc.letters ol {
    flex-wrap: nowrap;
  }

  .toc a {
    white-space: nowrap;
    border: 1px solid var(--line);
    background: var(--surface);
  }

  .entry {
    grid-template-columns: minmax(0, 1fr);
  }

  .count {
    display: none;
  }
}