/* ACI10 Shared Styles */
:root {
  color-scheme: light;
  --bg: #fafaf8;
  --text: #1a1a1a;
  --blue: #1a3a5c;
  --gold: #c8a96e;
  --grey: #888;
  --border: #ddd;
  --max-width: 860px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: "Georgia", "Noto Serif TC", serif;
  font-size: 16px;
  color: var(--text);
  background: var(--bg);
  line-height: 1.8;
}

/* ── Navigation ── */
nav {
  background: #fff;
  border-bottom: 1px solid var(--border);
  padding: 14px 40px;
  display: flex;
  align-items: center;
  gap: 24px;
  position: sticky;
  top: 0;
  z-index: 100;
}
nav .brand {
  font-size: 13px;
  font-weight: bold;
  color: var(--blue);
  text-decoration: none;
  letter-spacing: 0.5px;
}
nav a {
  font-size: 13px;
  color: var(--grey);
  text-decoration: none;
}
nav a:hover { color: var(--blue); }
nav .spacer { flex: 1; }

/* ── Page container ── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 52px 40px 80px;
}

/* ── Page header ── */
.page-header {
  text-align: center;
  margin-bottom: 48px;
  padding-bottom: 24px;
  border-bottom: 2px solid var(--border);
}
.page-header h1 {
  font-size: 24px;
  color: var(--text);
  margin-bottom: 8px;
}
.page-header .meta {
  font-size: 13px;
  color: var(--grey);
}

/* ── Section headers ── */
h2.section-title {
  font-size: 14px;
  color: var(--grey);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin: 52px 0 20px;
  border-left: 4px solid var(--gold);
  padding-left: 12px;
}

/* ── Bilingual pairs ── */
.pair { margin-bottom: 52px; }
.en {
  line-height: 2.3;
  margin-bottom: 10px;
  color: #222;
}
.zh {
  line-height: 2.3;
  color: var(--blue);
}
.note {
  font-size: 13px;
  color: var(--grey);
  margin-top: 8px;
  padding-left: 12px;
  border-left: 2px solid #e0d0b0;
  line-height: 1.8;
}

/* ── Divider ── */
hr.section {
  border: none;
  border-top: 1px solid var(--border);
  margin: 48px 0;
}

/* ── Cards (index page) ── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  margin-top: 24px;
}
.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px 24px;
  text-decoration: none;
  color: var(--text);
  transition: box-shadow 0.15s, border-color 0.15s;
}
.card:hover {
  box-shadow: 0 4px 16px rgba(0,0,0,0.08);
  border-color: var(--gold);
}
.card .class-num {
  font-size: 11px;
  color: var(--grey);
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 6px;
}
.card .class-title {
  font-size: 15px;
  font-weight: bold;
  color: var(--blue);
  margin-bottom: 8px;
}
.card .class-zh {
  font-size: 13px;
  color: var(--grey);
  margin-bottom: 12px;
}
.card .badges {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.badge {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 12px;
  background: #f0f0ee;
  color: var(--grey);
}
.badge.done {
  background: #e8f5e9;
  color: #2e7d32;
}
.badge.link {
  background: #e3f0fb;
  color: var(--blue);
  text-decoration: none;
}
.card.disabled {
  opacity: 0.45;
  pointer-events: none;
}

/* ── Class detail page ── */
.doc-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin: 24px 0 40px;
}
.doc-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 6px;
  font-size: 14px;
  text-decoration: none;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--blue);
  transition: all 0.15s;
}
.doc-btn:hover {
  border-color: var(--gold);
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}
.doc-btn.primary {
  background: var(--blue);
  color: #fff;
  border-color: var(--blue);
}
.doc-btn.primary:hover {
  background: #0f2540;
}

b { font-weight: bold; }