/* SHUGE DH Exhibition v0.1 — 数字博物馆 × 学术实验室 */

@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;500;700&family=Source+Serif+4:opsz,wght@8..60,400;8..60,500;8..60,700&family=IBM+Plex+Mono:wght@400;500&family=Source+Sans+3:wght@400;500;600&display=swap');

:root {
  --ink-black: #1a1a1a;
  --ink-charcoal: #2d2a26;
  --paper-white: #f7f3eb;
  --paper-cream: #efe9da;
  --archival-brown: #6b5944;
  --seal-red: #8b3a2e;
  --rule-gray: #c8bfa9;
  --rule-soft: #d8d2c4;
  --muted-gray: #8a8478;
  --verified-blue: #2a4a6a;
  --warning-amber: #a87f3a;
  --error-red: #9a3a2c;

  --font-serif-zh: 'Noto Serif SC', 'Source Han Serif SC', '宋体', 'SimSun', serif;
  --font-serif-en: 'Source Serif 4', 'Source Serif Pro', Georgia, serif;
  --font-mono: 'IBM Plex Mono', 'JetBrains Mono', Consolas, monospace;
  --font-sans: 'Source Sans 3', system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }

html {
  font-size: 16px;
  background: var(--paper-white);
  color: var(--ink-black);
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-serif-zh);
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--ink-black);
  background: var(--paper-white);
  -webkit-font-smoothing: antialiased;
}

/* ====== Masthead ====== */
.masthead {
  border-bottom: 2px solid var(--ink-black);
  padding: 1.5rem 2rem 1rem;
  text-align: center;
  background: var(--paper-white);
}
.masthead-title {
  font-family: var(--font-serif-zh);
  font-size: 1.7rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--ink-black);
  margin: 0 0 0.3rem;
}
.masthead-subtitle {
  font-family: var(--font-serif-en);
  font-size: 0.9rem;
  font-style: italic;
  color: var(--archival-brown);
  margin: 0;
  letter-spacing: 0.02em;
}

/* ====== Top Nav ====== */
.topnav {
  border-bottom: 1px solid var(--rule-gray);
  padding: 0.6rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--paper-white);
  font-family: var(--font-sans);
  font-size: 0.85rem;
}
.topnav-links {
  display: flex;
  gap: 1.5rem;
}
.topnav a {
  color: var(--ink-charcoal);
  text-decoration: none;
  padding: 0.2rem 0;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s;
}
.topnav a:hover {
  border-bottom-color: var(--ink-charcoal);
}
.topnav a.active {
  border-bottom: 1px solid var(--ink-black);
  font-weight: 600;
  color: var(--ink-black);
}
.topnav-meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted-gray);
}

/* ====== Body ====== */
.body {
  max-width: 820px;
  margin: 2rem auto;
  padding: 0 2rem 3rem;
}

.hero {
  text-align: center;
  padding: 2rem 0 2.5rem;
  border-bottom: 1px solid var(--rule-gray);
  margin-bottom: 2.5rem;
}
.hero h1 {
  font-family: var(--font-serif-zh);
  font-size: 2.4rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--ink-black);
  margin: 0 0 0.5rem;
}
.hero h1::after {
  content: " ·";
  color: var(--seal-red);
  font-weight: 400;
}
.hero-lead {
  font-family: var(--font-serif-en);
  font-size: 1rem;
  font-style: italic;
  color: var(--archival-brown);
  margin: 0 0 1.5rem;
}

/* ====== Stat Badges ====== */
.stat-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  margin: 1.5rem 0 0.5rem;
}
.stat {
  font-family: var(--font-sans);
  background: var(--paper-cream);
  border: 1px solid var(--rule-soft);
  padding: 0.5rem 1rem;
  min-width: 110px;
  text-align: center;
}
.stat-value {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 500;
  color: var(--ink-black);
  line-height: 1.2;
}
.stat-label {
  display: block;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted-gray);
  margin-top: 0.2rem;
}

/* ====== Sections ====== */
section {
  margin: 3rem 0;
}
section h2 {
  font-family: var(--font-serif-zh);
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--ink-black);
  margin: 0 0 0.3rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--rule-gray);
}
section h2::before {
  content: "§ ";
  font-family: var(--font-mono);
  color: var(--seal-red);
  font-weight: 400;
}
section h3 {
  font-family: var(--font-serif-zh);
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--ink-charcoal);
  margin: 1.5rem 0 0.5rem;
}

p {
  margin: 0.7rem 0;
  text-align: justify;
}

/* ====== Cards ====== */
.card {
  background: var(--paper-cream);
  border: 1px solid var(--rule-soft);
  padding: 1.2rem 1.5rem;
  margin: 1rem 0;
}
.card-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.7rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px dashed var(--rule-gray);
}
.card-title {
  font-family: var(--font-serif-zh);
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--ink-black);
  margin: 0;
}
.card-en {
  font-family: var(--font-serif-en);
  font-style: italic;
  color: var(--archival-brown);
  font-size: 0.9rem;
}

/* ====== Badges ====== */
.badge {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.15rem 0.5rem;
  border: 1px solid currentColor;
  margin: 0 0.3rem 0.3rem 0;
  background: transparent;
}
.badge-jda {
  color: var(--seal-red);
}
.badge-evidence {
  color: var(--verified-blue);
}
.badge-highlight {
  color: var(--archival-brown);
}
.badge-status-brief {
  color: var(--verified-blue);
  background: rgba(42, 74, 106, 0.08);
}
.badge-status-insufficient {
  color: var(--warning-amber);
  background: rgba(168, 127, 58, 0.08);
}
.badge-status-searching {
  color: var(--muted-gray);
}
.badge-status-open {
  color: var(--archival-brown);
  background: rgba(107, 89, 68, 0.08);
}

/* ====== Meta table ====== */
.meta-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  margin: 0.8rem 0;
}
.meta-table th, .meta-table td {
  text-align: left;
  padding: 0.4rem 0.7rem;
  border-bottom: 1px solid var(--rule-soft);
  vertical-align: top;
}
.meta-table th {
  background: var(--paper-cream);
  color: var(--archival-brown);
  font-weight: 600;
  width: 30%;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.meta-table td {
  color: var(--ink-black);
}
.meta-table code, .meta-table .mono {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--archival-brown);
}

/* ====== Citation / Quote ====== */
.citation {
  background: var(--paper-cream);
  border-left: 4px solid var(--seal-red);
  padding: 0.8rem 1rem;
  margin: 1rem 0;
  font-family: var(--font-serif-zh);
  font-size: 0.95rem;
  color: var(--ink-charcoal);
}
.citation-cite {
  display: block;
  margin-top: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--archival-brown);
}

/* ====== Run row (accordion) ====== */
.run {
  border: 1px solid var(--rule-soft);
  margin: 0.7rem 0;
  background: var(--paper-white);
}
.run-summary {
  padding: 0.7rem 1rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem;
}
.run-summary:hover { background: var(--paper-cream); }
.run-question {
  font-family: var(--font-serif-zh);
  font-size: 1rem;
  color: var(--ink-black);
  flex: 1;
}
.run-meta {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--muted-gray);
  white-space: nowrap;
}
.run-detail {
  display: none;
  padding: 0 1rem 1rem;
  border-top: 1px dashed var(--rule-gray);
  font-family: var(--font-sans);
  font-size: 0.88rem;
}
.run-detail.open {
  display: block;
}
.claim {
  border-left: 2px solid var(--rule-gray);
  padding: 0.5rem 0 0.5rem 0.8rem;
  margin: 0.6rem 0;
}
.claim-type {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--muted-gray);
  letter-spacing: 0.05em;
}
.claim-text {
  font-family: var(--font-serif-zh);
  font-size: 0.92rem;
  color: var(--ink-black);
  margin: 0.3rem 0;
  line-height: 1.6;
}
.claim-cite {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--verified-blue);
}

/* ====== Filters (radio) ====== */
.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 1rem 0;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  padding: 0.7rem 1rem;
  background: var(--paper-cream);
  border: 1px solid var(--rule-soft);
}
.filter-row label {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  color: var(--ink-charcoal);
  cursor: pointer;
}
.filter-row input[type="radio"] {
  margin: 0;
  accent-color: var(--seal-red);
}

/* ====== Footer ====== */
footer {
  border-top: 2px solid var(--ink-black);
  padding: 1.5rem 2rem 2rem;
  text-align: center;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--muted-gray);
  background: var(--paper-white);
  margin-top: 4rem;
}
footer a {
  color: var(--ink-charcoal);
  text-decoration: none;
  border-bottom: 1px dotted var(--rule-gray);
}
footer .mono {
  font-family: var(--font-mono);
  color: var(--archival-brown);
}

/* ====== Works grid ====== */
.works-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

/* ====== Page-specific ====== */
.page-overview .hero { background: transparent; }
.page-collections .collection-detail { margin: 2rem 0; }
.page-evidence .filter-row { position: sticky; top: 0; z-index: 10; }
.page-research .qa-table { font-size: 0.85rem; }

/* ====== Utility ====== */
.mono { font-family: var(--font-mono); font-size: 0.85em; color: var(--archival-brown); }
.dim { color: var(--muted-gray); }
.seal { color: var(--seal-red); }
.verified { color: var(--verified-blue); }
.warning { color: var(--warning-amber); }

@media (max-width: 768px) {
  .body { padding: 0 1.2rem 2rem; }
  .masthead, .topnav, footer { padding-left: 1.2rem; padding-right: 1.2rem; }
  .topnav { flex-wrap: wrap; gap: 0.5rem; }
  .topnav-links { gap: 1rem; flex-wrap: wrap; }
  .hero h1 { font-size: 1.8rem; }
  .stat-row { gap: 0.5rem; }
  .stat { min-width: 90px; padding: 0.4rem 0.7rem; }
  .works-grid { grid-template-columns: 1fr; }
}