:root {
  --paper: #efe8dc;
  --card: #fbf7f0;
  --ink: #1a1814;
  --muted: #5c564c;
  --line: #ddd2c2;
  --accent: #1d3c5e;
  --live: #8c2f24;
  --moss: #2d6a4f;
  --gold: #8a6232;
  --sans: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  --serif: "Noto Serif TC", "Songti TC", "PMingLiU", serif;
  --s1: 0.25rem;
  --s2: 0.5rem;
  --s3: 0.75rem;
  --s4: 1rem;
  --s5: 1.5rem;
  --s6: 2rem;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.5;
  background: var(--paper);
  min-height: 100vh;
}
a { color: var(--accent); }
a:hover { color: var(--live); }
button, input, textarea, select { font: inherit; color: inherit; }
button, .text-button {
  background: var(--ink);
  color: var(--card);
  border: 1px solid var(--ink);
  border-radius: 8px;
  padding: 0.55rem 0.9rem;
  min-height: 2.75rem;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
button:hover { background: var(--accent); border-color: var(--accent); }
button.secondary, .text-button {
  background: var(--card);
  color: var(--ink);
  border-color: var(--line);
}
button.secondary:hover, .text-button:hover { border-color: var(--accent); color: var(--accent); }
h1, h2, h3, .page-title {
  font-family: var(--serif);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: 0;
  overflow: visible;
  text-overflow: unset;
  white-space: normal;
  overflow-wrap: break-word;
}
h1, .page-title { font-size: 1.6rem; margin: 0 0 var(--s4); }
h2 { font-size: 1.2rem; margin: 0; }
h3 { font-size: 1rem; margin: 0; }
p { margin: 0; }

.mast {
  display: flex;
  align-items: center;
  gap: var(--s3);
  padding: var(--s3) var(--s4);
  position: sticky;
  top: 0;
  z-index: 2;
  background: rgba(239, 232, 220, 0.94);
  border-bottom: 1px solid var(--line);
}
.brand, .brand-mark {
  font-family: var(--serif);
  font-size: 1.15rem;
  line-height: 1.2;
  text-decoration: none;
  color: inherit;
  flex: none;
}
.brand-mark { display: block; margin: 0 0 var(--s3); }
.nav { display: flex; flex-wrap: wrap; gap: var(--s1); }
.nav a {
  text-decoration: none;
  color: var(--ink);
  padding: 0.3rem 0.55rem;
  border-radius: 999px;
  font-size: 0.92rem;
}
.nav a[aria-current="page"] { background: var(--card); }
.nav a:hover { background: var(--card); }
.mast-search { margin-left: auto; }
.mast-search input, .stack input, .stack select, .stack textarea, .ask-form textarea, .toolbar input {
  width: 100%;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.55rem 0.7rem;
  min-height: 2.75rem;
}
.mast-search input { width: 14rem; }
main { width: min(1120px, calc(100% - 2rem)); margin: var(--s5) auto var(--s6); }

.overview, .board { display: grid; gap: var(--s3); align-items: stretch; }
.overview { grid-template-columns: repeat(6, minmax(0, 1fr)); }
.overview .span-3 { grid-column: span 3; }
.overview .span-2 { grid-column: span 2; }
.board { grid-template-columns: repeat(auto-fill, minmax(17.5rem, 1fr)); align-items: start; }
.board-section { display: grid; gap: var(--s3); margin-bottom: var(--s5); }
.board-section > h2 a { color: inherit; text-decoration: none; }
.board-section > h2 a:hover { color: var(--accent); }

.card, .auth-card, .panel, .empty, .answer {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: var(--s4);
}
.card { display: grid; gap: var(--s2); align-content: start; }
.card-top .page-title { margin: 0; }
.card-top, .record header, .section-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--s3);
}
.card-top h2 { flex: 1 1 auto; min-width: 0; }
.card-top h2 a, .card > h2 a { color: inherit; text-decoration: none; }
.card-top h2 a:hover, .card > h2 a:hover { color: var(--accent); }
.metric {
  margin: 0;
  flex: none;
  font-family: var(--serif);
  font-size: 1.5rem;
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
}
.meta, .quiet { color: var(--muted); font-size: 0.92rem; }
.preview, .rows, .plain-links, .topic-list { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--s2); }
.preview li, .rows li { display: grid; gap: 0.1rem; }
.preview a, .rows a { color: inherit; text-decoration: none; overflow-wrap: break-word; }
.preview a:hover, .rows a:hover { color: var(--accent); }
.pair { display: flex; justify-content: space-between; gap: var(--s3); align-items: baseline; }
.pair a { flex: 1 1 auto; min-width: 0; overflow-wrap: break-word; }
.pair span:last-child { flex: none; color: var(--muted); font-variant-numeric: tabular-nums; }

.facts, .record dl, .site-facts, .fold dl { margin: 0; display: grid; gap: 0; }
.facts div, .record dl > div, .site-facts div, .fold dl > div {
  display: flex;
  justify-content: space-between;
  gap: var(--s3);
  padding: var(--s2) 0;
  border-top: 1px solid var(--line);
}
.facts dt, .record dt, .site-facts dt, .fold dt { color: var(--muted); font-size: 0.82rem; flex: none; }
.facts dd, .record dd, .site-facts dd, .fold dd { margin: 0; text-align: right; overflow-wrap: anywhere; }
.site-url { overflow-wrap: anywhere; }

.fold { border-top: 1px solid var(--line); padding-top: var(--s2); }
.card.fold, .panel.fold { border-top: 1px solid var(--line); }
.fold > summary {
  display: flex;
  align-items: flex-start;
  gap: var(--s2);
  cursor: pointer;
  list-style: none;
  min-height: 2.75rem;
  padding: var(--s2) 0;
  color: var(--accent);
}
.fold > summary::-webkit-details-marker { display: none; }
.fold > summary::marker { content: ""; }
.fold > summary::before {
  content: "";
  flex: 0 0 0.45rem;
  width: 0.45rem;
  height: 0.45rem;
  margin-top: 0.45rem;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(-45deg);
}
.fold[open] > summary::before { transform: rotate(45deg); margin-top: 0.28rem; }
.fold-open { display: none; }
.fold[open] .fold-open { display: inline; }
.fold[open] .fold-closed { display: none; }
.fold > summary h2 { color: var(--ink); flex: 1 1 auto; }
.fold-body { display: grid; gap: var(--s3); padding-bottom: var(--s2); }

.toolbar { display: flex; flex-wrap: wrap; gap: var(--s2); align-items: center; margin-bottom: var(--s4); }
.toolbar form, .usage-search { flex: 1; min-width: 12rem; }
.filters { display: flex; flex-wrap: wrap; gap: var(--s2); margin-bottom: var(--s4); }
.filters button { background: var(--card); color: var(--ink); border: 1px solid var(--line); }
.filters button[aria-pressed="true"] { background: var(--accent); color: var(--card); border-color: var(--accent); }
.chip {
  display: inline-block;
  border-radius: 999px;
  padding: 0.05rem 0.5rem;
  font-size: 0.78rem;
  background: #efe6d4;
  color: var(--accent);
}
.chip-live { color: var(--live); background: #f6d4c8; }
.chip-done { color: var(--muted); }
.chips { display: flex; flex-wrap: wrap; gap: var(--s2); }

.page-grid { display: grid; grid-template-columns: minmax(0, 1fr) 17rem; gap: var(--s4); align-items: start; }
.facts {
  position: sticky;
  top: 5rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: var(--s4);
}
.prose { min-width: 0; display: grid; gap: var(--s3); }
.prose table { width: 100%; border-collapse: collapse; }
.prose th, .prose td { border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; padding: var(--s2); }
.prose blockquote, .answer blockquote {
  margin: 0;
  padding-left: var(--s3);
  border-left: 3px solid var(--line);
  color: var(--muted);
}
.source-fold pre, .prose pre {
  white-space: pre-wrap;
  background: #f3ecdf;
  border-radius: 8px;
  padding: var(--s3);
  overflow: auto;
}
.tool-list { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--s3); }
.tool-list li { display: grid; gap: 0.15rem; }
.tool-list strong { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.92rem; }

.panel, .empty, .answer { margin-bottom: var(--s3); }
.stack, .ask-form { display: grid; gap: var(--s3); }
.stack label, .check { display: grid; gap: var(--s1); }
.check { grid-template-columns: auto 1fr; align-items: center; }
.saved-urls { display: grid; gap: var(--s2); color: var(--muted); }
.inline-form { margin: 0; }
.flash { border-radius: 8px; padding: var(--s3); background: #e7f2ea; margin-bottom: var(--s3); }
.flash-err { background: #fde8e4; }
.flash-warn { background: #fff1d6; }
body:has(.auth-card) main {
  min-height: calc(100vh - 2rem);
  display: grid;
  place-items: center;
  margin: 0 auto;
}
.auth-card { width: min(26rem, 100%); }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

@media (max-width: 860px) {
  .mast { flex-wrap: wrap; }
  .mast-search, .mast-search input { width: 100%; margin-left: 0; }
  .overview, .page-grid, .board { grid-template-columns: 1fr; }
  .overview .span-3, .overview .span-2 { grid-column: auto; }
  .facts { position: static; }
  .page-grid { display: flex; flex-direction: column; }
  .facts { order: -1; }
  .toolbar { flex-direction: column; align-items: stretch; }
}