/* ===========================================================
   dept.css — 分科分發「校系獨立頁」樣式（/dept/*.html）
   -----------------------------------------------------------
   顏色一律取自 /styles/tokens.css（由 tokens.json 編譯，唯一改色處）。
   本檔只做語意別名 + 版面，不硬寫色碼。
   深色模式：與首頁同一開關（localStorage ast_theme → :root[data-theme='dark']）。
   =========================================================== */

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

:root {
  --bg: var(--color-surface-subtle);
  --surface: var(--color-surface-page);
  --surface2: var(--color-surface-sunken);
  --border: var(--color-border-subtle);
  --text: var(--color-ink-primary);
  --text2: var(--color-ink-secondary);
  --text3: var(--color-ink-tertiary);
  --accent: var(--color-brand-blue);
  --accent2: var(--color-brand-link);
  --radius: var(--radius-md);
  --shadow: var(--shadow-card);
}

:root[data-theme='dark'] {
  --bg: var(--color-surface-dark);
  --surface: color-mix(in srgb, var(--color-surface-dark) 90%, var(--color-surface-page));
  --surface2: color-mix(in srgb, var(--color-surface-dark) 82%, var(--color-surface-page));
  --border: color-mix(in srgb, var(--color-surface-page) 18%, transparent);
  --text: var(--color-ink-on-dark);
  --text2: var(--color-ink-on-dark-muted);
  --text3: color-mix(in srgb, var(--color-ink-on-dark) 54%, transparent);
  --accent2: color-mix(in srgb, var(--color-brand-blue) 62%, var(--color-ink-on-dark));
  color-scheme: dark;
}

html { font-size: 16px; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-family-base);
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--accent2); }

/* ===== Header ===== */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: inherit;
  padding: 4px 2px;
}

.logo-mark {
  width: 32px;
  height: 32px;
  flex: none;
  background: var(--color-brand-blue);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .95rem;
  font-weight: var(--font-weight-bold);
  color: var(--color-ink-on-accent);
}

.brand-name { font-size: .95rem; font-weight: var(--font-weight-bold); }
.brand-sub { font-size: .72rem; color: var(--text2); }

.header-spacer { flex: 1; }

.theme-toggle {
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--text2);
  border-radius: var(--radius-pill);
  padding: 7px 14px;
  font-size: .8rem;
  font-family: inherit;
  cursor: pointer;
  min-height: 32px;
}

.theme-toggle:hover { color: var(--text); }

/* ===== Layout ===== */
.wrap {
  width: 100%;
  max-width: 56rem;
  margin: 0 auto;
  padding: 0 16px;
}

main { flex: 1; padding: 18px 0 40px; }

.crumbs {
  font-size: .78rem;
  color: var(--text3);
  padding: 6px 0 10px;
  overflow-x: auto;
  white-space: nowrap;
}

.crumbs a { color: var(--text2); text-decoration: none; padding: 4px 2px; display: inline-block; }
.crumbs a:hover { color: var(--accent2); }
.crumbs span[aria-current] { color: var(--text); }

.page-head { margin-bottom: 14px; }

.page-head h1 {
  font-size: clamp(1.5rem, 5vw, 2.1rem);
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.02em;
  line-height: 1.25;
}

.page-head .school-line {
  font-size: .95rem;
  color: var(--text2);
  margin-top: 6px;
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 12px;
}

.chip {
  font-size: .75rem;
  color: var(--text2);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  padding: 4px 11px;
}

.chip.is-accent {
  color: var(--color-brand-blue);
  background: var(--color-brand-blue-tint);
  border-color: transparent;
}

/* ===== Card ===== */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
  margin-bottom: 16px;
}

.card-title {
  font-size: 1.02rem;
  font-weight: var(--font-weight-semibold);
  margin-bottom: 4px;
}

.card-sub {
  font-size: .8rem;
  color: var(--text3);
  margin-bottom: 12px;
}

.lede {
  font-size: .95rem;
  color: var(--text2);
  margin-bottom: 16px;
}

/* ===== Stat grid ===== */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(9.5rem, 1fr));
  gap: 10px;
}

.stat {
  background: var(--surface2);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
}

.stat-label {
  font-size: .72rem;
  color: var(--text3);
  display: block;
  margin-bottom: 4px;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.stat-value .unit {
  font-size: .8rem;
  font-weight: var(--font-weight-regular);
  color: var(--text2);
  margin-left: 2px;
}

.stat-note {
  font-size: .7rem;
  color: var(--text3);
  margin-top: 3px;
}

.stat.is-primary { background: var(--color-brand-blue-tint); }
.stat.is-primary .stat-value { color: var(--color-brand-blue); }

/* ===== Table ===== */
.table-scroll { overflow-x: auto; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: .88rem;
  min-width: 22rem;
}

caption {
  caption-side: top;
  text-align: left;
  font-size: .78rem;
  color: var(--text3);
  padding-bottom: 8px;
}

th, td {
  padding: 9px 10px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

thead th {
  font-size: .74rem;
  font-weight: var(--font-weight-medium);
  color: var(--text3);
  background: var(--surface2);
}

tbody tr:last-child th, tbody tr:last-child td { border-bottom: none; }

tbody tr.is-current td, tbody tr.is-current th { background: var(--color-brand-blue-tint); }

td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }

tfoot td {
  font-size: .8rem;
  color: var(--text2);
  border-bottom: none;
}

/* ===== Notice ===== */
.notice {
  display: flex;
  gap: 8px;
  align-items: flex-start;
  background: var(--surface2);
  border-radius: var(--radius-sm);
  padding: 11px 13px;
  font-size: .8rem;
  color: var(--text2);
  margin-top: 12px;
}

.notice strong { color: var(--text); font-weight: var(--font-weight-semibold); }

/* ===== CTA ===== */
.cta-card {
  background: var(--color-surface-dark);
  color: var(--color-ink-on-dark);
  border: none;
}

.cta-card .card-title { color: var(--color-ink-on-dark); }
.cta-card p { font-size: .88rem; color: var(--color-ink-on-dark-muted); margin-bottom: 14px; }

.cta-row { display: flex; flex-wrap: wrap; gap: 10px; }

.btn {
  display: inline-block;
  padding: 11px 20px;
  border-radius: var(--radius-pill);
  font-size: .9rem;
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  min-height: 44px;
  line-height: 22px;
}

.btn-primary { background: var(--color-brand-blue); color: var(--color-ink-on-accent); }
.btn-primary:hover { background: var(--color-brand-blue-hover); }

.btn-ghost {
  background: transparent;
  color: var(--color-ink-on-dark);
  border: 1px solid var(--color-ink-on-dark-muted);
}

.btn-ghost:hover { border-color: var(--color-ink-on-dark); }

/* ===== Link lists ===== */
.link-list { list-style: none; }

.link-list li { border-bottom: 1px solid var(--border); }
.link-list li:last-child { border-bottom: none; }

.link-list a {
  display: block;
  padding: 10px 2px;
  font-size: .88rem;
  text-decoration: none;
  color: var(--accent2);
}

.link-list a:hover { text-decoration: underline; }

.link-list .meta { color: var(--text3); font-size: .78rem; margin-left: 6px; }

.sibling-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(13.5rem, 1fr));
  gap: 2px 16px;
  list-style: none;
}

.sibling-grid a {
  display: block;
  padding: 9px 2px;
  font-size: .86rem;
  text-decoration: none;
  color: var(--accent2);
  border-bottom: 1px solid var(--border);
}

.sibling-grid a:hover { text-decoration: underline; }
.sibling-grid .cut { color: var(--text3); font-size: .76rem; margin-left: 4px; }

/* ===== FAQ ===== */
.faq { border-top: 1px solid var(--border); padding-top: 12px; margin-top: 12px; }
.faq:first-of-type { border-top: none; padding-top: 0; margin-top: 0; }
.faq h3 { font-size: .92rem; font-weight: var(--font-weight-semibold); margin-bottom: 5px; }
.faq p { font-size: .85rem; color: var(--text2); }

/* ===== Ad slot（預備位；預設不顯示，未載入任何第三方程式碼）===== */
.ad-slot {
  min-height: 0;
  margin: 0 0 16px;
  border-radius: var(--radius-sm);
}

.ad-slot[hidden] { display: none; }

/* ===== Footer ===== */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
  padding: 22px 0 30px;
  font-size: .78rem;
  color: var(--text2);
  text-align: center;
}

.site-footer p { margin-bottom: 6px; }

.site-footer a {
  color: var(--text2);
  text-decoration: none;
  display: inline-block;
  padding: 6px 5px;
}

.site-footer a:hover { color: var(--accent2); }

.footer-meta { color: var(--text3); font-size: .72rem; }

@media (max-width: 600px) {
  .brand-sub { display: none; }
  main { padding: 12px 0 28px; }
  .card { padding: 15px; }
  .stat-value { font-size: 1.32rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}