/* radar.css - 大考雷達站 樣式系統 */
:root {
  --bg-dark: #0a0e17;
  --bg-panel: #111827;
  --bg-card: #1f2937;
  --border-color: #374151;
  --txt-primary: #f9fafb;
  --txt-secondary: #9ca3af;
  --accent: #2563eb;
  --accent-glow: rgba(37, 99, 235, 0.4);
  --accent-cyan: #06b6d4;
  --accent-violet: #8b5cf6;
  --danger: #ef4444;
  --success: #10b981;
}

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

body {
  font-family: -apple-system, "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;
  background-color: var(--bg-dark);
  color: var(--txt-primary);
  line-height: 1.5;
}

/* Header & Navigation */
header.site-header {
  background-color: var(--bg-panel);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 24px;
}

header.site-header .logo {
  font-size: 18px;
  font-weight: 800;
  color: var(--txt-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

header.site-header .logo::before {
  content: "";
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-cyan);
}

header.site-header nav {
  display: flex;
  gap: 20px;
}

header.site-header nav a {
  color: var(--txt-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}

header.site-header nav a:hover, header.site-header nav a.active {
  color: var(--txt-primary);
}

/* Landing Page Hero */
.hero {
  padding: 80px 20px;
  text-align: center;
  position: relative;
  overflow: hidden;
  background: radial-gradient(circle at 50% 50%, rgba(37, 99, 235, 0.15) 0%, transparent 60%);
}

.hero h1 {
  font-size: 42px;
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: 16px;
  background: linear-gradient(to right, #ffffff, #93c5fd, #38bdf8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  color: var(--txt-secondary);
  font-size: 18px;
  max-width: 600px;
  margin: 0 auto 32px;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  margin: 0 auto 36px;
}

.hero-stats .stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  min-width: 130px;
  padding: 18px 28px;
  background: linear-gradient(180deg, rgba(31, 41, 55, 0.7), rgba(17, 24, 39, 0.7));
  border: 1px solid var(--border-color);
  border-radius: 16px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.hero-stats .stat-num {
  font-size: 32px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--accent-cyan);
  text-shadow: 0 0 20px rgba(6, 182, 212, 0.55);
}

.hero-stats .stat-lab {
  font-size: 13px;
  color: var(--txt-secondary);
}

@media (max-width: 480px) {
  .hero-stats .stat { min-width: 0; flex: 1 1 100%; padding: 14px 20px; }
  .hero-stats .stat-num { font-size: 28px; }
}

.btn-container {
  display: flex;
  gap: 16px;
  justify-content: center;
}

.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
  font-size: 15px;
  cursor: pointer;
  transition: all 0.2s;
  border: 1px solid transparent;
}

.btn-primary {
  background-color: var(--accent);
  color: #fff;
  box-shadow: 0 4px 12px var(--accent-glow);
}

.btn-primary:hover {
  background-color: #1d4ed8;
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: transparent;
  border-color: var(--border-color);
  color: var(--txt-primary);
}

.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.05);
  border-color: var(--txt-secondary);
}

/* Quick Access Cards */
.section-title {
  text-align: center;
  font-size: 24px;
  margin: 40px 0 24px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  max-width: 1000px;
  margin: 0 auto 60px;
  padding: 0 20px;
}

.radar-card {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 24px;
  text-align: left;
  transition: all 0.3s;
  text-decoration: none;
  color: inherit;
  position: relative;
}

.radar-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-cyan);
  box-shadow: 0 8px 20px rgba(6, 182, 212, 0.15);
}

.radar-card h3 {
  font-size: 18px;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.radar-card h3::after {
  content: "→";
  font-size: 16px;
  color: var(--accent-cyan);
}

.radar-card p {
  color: var(--txt-secondary);
  font-size: 14px;
  margin-bottom: 16px;
}

.radar-card .tag-pill {
  display: inline-block;
  background-color: rgba(6, 182, 212, 0.1);
  color: var(--accent-cyan);
  font-size: 12px;
  padding: 2px 8px;
  border-radius: 999px;
  border: 1px solid rgba(6, 182, 212, 0.2);
}

/* Trends Dashboard Layout */
.dashboard {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 20px 60px;
}

.tabs-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 12px;
  flex-wrap: wrap;
  gap: 12px;
}

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

.tab-btn {
  background-color: transparent;
  border: 1px solid var(--border-color);
  color: var(--txt-secondary);
  padding: 6px 16px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s;
}

.tab-btn.active {
  background-color: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.dashboard-panel {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 24px;
}

.panel-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.panel-desc {
  font-size: 13px;
  color: var(--txt-secondary);
  font-weight: normal;
}

/* Trends 主題卡片（accordion：標題列＋風扇葉下拉展開圖／表） */
.trend-card {
  background: var(--bg-panel);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  margin-bottom: 16px;
  overflow: hidden;
}
.trend-card > summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 20px 24px;
}
.trend-card > summary::-webkit-details-marker { display: none; }
.trend-card > summary::after {
  content: "▾";
  margin-left: 4px;
  color: var(--accent-cyan);
  font-size: 14px;
  transition: transform .2s;
}
.trend-card[open] > summary::after { transform: rotate(180deg); }
.trend-card .trend-title { font-size: 18px; font-weight: 700; color: var(--txt-primary); }
.trend-card .trend-tag {
  margin-left: auto;
  font-size: 12px; font-weight: 600;
  padding: 3px 10px; border-radius: 999px;
  background: var(--bg-card); color: var(--accent-cyan);
  border: 1px solid var(--border-color);
}
.trend-body { border-top: 1px solid var(--border-color); padding: 20px 24px; }
.trend-toolbar { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.trend-note { font-size: 12px; color: var(--txt-secondary); }
.trend-pdf { margin-left: auto; }
.trend-pdf:disabled { cursor: not-allowed; opacity: .5; }
.trend-placeholder {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 10px; min-height: 200px;
  color: var(--txt-secondary); font-size: 14px;
  border: 1px dashed var(--border-color); border-radius: 8px;
  background: var(--bg-card);
}
.trend-placeholder .ph-icon { font-size: 34px; }

/* Trends analysis workspace */
.trend-page {
  max-width: 1180px;
  margin: 0 auto;
  padding: 42px 24px 72px;
}

.trend-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 28px;
  align-items: end;
  margin-bottom: 24px;
}

.trend-kicker {
  display: block;
  margin-bottom: 8px;
  color: var(--accent-cyan);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.trend-hero h1 {
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1.15;
  letter-spacing: -.03em;
}

.trend-hero p {
  max-width: 680px;
  margin-top: 12px;
  color: var(--txt-secondary);
  line-height: 1.75;
}

.trend-exam-tabs {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
  padding: 5px;
  border: 1px solid var(--border-color);
  border-radius: 14px;
  background: rgba(17, 24, 39, .86);
}

.trend-exam-tabs .tab-btn {
  min-width: 90px;
  padding: 10px 16px;
  border: 0;
  border-radius: 10px;
}

.trend-exam-tabs .tab-btn.active {
  background: linear-gradient(135deg, #2563eb, #0891b2);
  box-shadow: 0 8px 20px rgba(37, 99, 235, .2);
}

.trend-scope {
  display: grid;
  grid-template-columns: minmax(0, 1fr) repeat(3, minmax(130px, .42fr));
  gap: 12px;
  margin-bottom: 34px;
  padding: 18px;
  border: 1px solid var(--border-color);
  border-radius: 16px;
  background:
    radial-gradient(circle at 90% 0%, rgba(6, 182, 212, .09), transparent 32%),
    var(--bg-panel);
}

.trend-scope-main {
  padding: 4px 8px;
}

.trend-scope-main strong {
  display: block;
  font-size: 20px;
}

.trend-scope-main span {
  display: block;
  margin-top: 5px;
  color: var(--txt-secondary);
  font-size: 13px;
}

.trend-scope-stat {
  padding: 13px 15px;
  border: 1px solid rgba(55, 65, 81, .8);
  border-radius: 12px;
  background: rgba(31, 41, 55, .58);
}

.trend-scope-stat strong {
  display: block;
  font-size: 19px;
}

.trend-scope-stat span {
  color: var(--txt-secondary);
  font-size: 11px;
}

.trend-group {
  margin-top: 34px;
}

.trend-group-heading {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: end;
  margin-bottom: 14px;
}

.trend-group-heading h2 {
  font-size: 20px;
}

.trend-group-heading p {
  color: var(--txt-secondary);
  font-size: 12px;
  text-align: right;
}

.trend-analysis-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.analysis-card {
  position: relative;
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--border-color);
  border-radius: 16px;
  background: linear-gradient(145deg, rgba(17, 24, 39, .98), rgba(15, 23, 42, .94));
}

.analysis-card::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(circle at 100% 0%, rgba(6, 182, 212, .07), transparent 28%);
}

.analysis-card-head,
.analysis-card-body,
.analysis-card-foot {
  position: relative;
  z-index: 1;
}

.analysis-card-head {
  padding: 21px 22px 15px;
}

.analysis-card-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}

.analysis-card-tag,
.analysis-card-scope {
  display: inline-flex;
  align-items: center;
  padding: 4px 9px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 700;
}

.analysis-card-tag {
  background: rgba(37, 99, 235, .16);
  color: #bfdbfe;
}

.analysis-card-scope {
  border: 1px solid rgba(6, 182, 212, .28);
  color: #a5f3fc;
}

.analysis-card h3 {
  font-size: 18px;
  line-height: 1.5;
}

.analysis-card-subtitle {
  margin-top: 7px;
  color: var(--txt-secondary);
  font-size: 12px;
  line-height: 1.6;
}

.analysis-card-body {
  min-height: 190px;
  padding: 0 22px 20px;
}

.analysis-card-foot {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 22px;
  border-top: 1px solid rgba(55, 65, 81, .7);
  color: var(--txt-secondary);
  font-size: 11px;
}

.analysis-card-foot strong {
  color: var(--txt-primary);
}

.analysis-card--wide {
  grid-column: 1 / -1;
}

/* 卡片閉環：勾選相關題目 → 沿用 /print.html?ids= 輸出 PDF */
.trend-export {
  margin: 0 22px 18px;
  border: 1px solid rgba(55, 65, 81, .82);
  border-radius: 12px;
  background: rgba(15, 23, 42, .5);
  overflow: hidden;
}
.trend-export > summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 16px;
  font-size: 13px;
  font-weight: 700;
  color: var(--txt-primary);
}
.trend-export > summary::-webkit-details-marker { display: none; }
.trend-export > summary::before {
  content: "⤓";
  color: var(--accent-cyan);
  font-size: 15px;
}
.trend-export > summary::after {
  content: "▾";
  margin-left: auto;
  color: var(--accent-cyan);
  transition: transform .2s;
}
.trend-export[open] > summary::after { transform: rotate(180deg); }
.trend-export-count {
  margin-left: auto;
  font-size: 12px;
  font-weight: 600;
  color: var(--accent-cyan);
}
.trend-export[open] > summary .trend-export-count { margin-left: 0; }
.trend-export-body {
  border-top: 1px solid rgba(55, 65, 81, .7);
  padding: 14px 16px;
}
.trend-export-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}
.trend-mini-btn {
  padding: 5px 11px;
  border: 1px solid rgba(6, 182, 212, .35);
  border-radius: 999px;
  background: rgba(6, 182, 212, .08);
  color: #a5f3fc;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
}
.trend-mini-btn:hover { background: rgba(6, 182, 212, .16); }
.trend-ans {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 12px;
  color: var(--txt-secondary);
  cursor: pointer;
}
.trend-ans.disabled { opacity: .45; cursor: not-allowed; }
.trend-export-hint {
  margin: 0 0 10px;
  color: #fca5a5;
  font-size: 12px;
}
.trend-export-list {
  max-height: 240px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 12px;
}
.trend-q {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 6px 8px;
  border-radius: 8px;
  font-size: 13px;
  color: var(--txt-primary);
  cursor: pointer;
}
.trend-q:hover { background: rgba(31, 41, 55, .6); }
.trend-q input { flex: 0 0 auto; }
.trend-q span { flex: 1 1 auto; }
.trend-q a {
  flex: 0 0 auto;
  color: var(--accent-cyan);
  text-decoration: none;
  font-weight: 700;
}
.trend-export-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.trend-pdf-btn {
  padding: 8px 16px;
  border: none;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent-cyan));
  color: #06121f;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
}
.trend-pdf-btn.ghost {
  background: transparent;
  border: 1px solid rgba(6, 182, 212, .4);
  color: #a5f3fc;
}
.trend-pdf-btn:hover { filter: brightness(1.06); }

.linprog-question-picker {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  padding: 18px;
  border: 1px solid rgba(55, 65, 81, .82);
  border-radius: 14px;
  background: rgba(15, 23, 42, .54);
}

.linprog-question-count strong {
  display: block;
  color: var(--accent-cyan);
  font-size: 30px;
}

.linprog-question-count span {
  color: var(--txt-secondary);
  font-size: 11px;
}

.linprog-select {
  width: 100%;
  min-width: 0;
  padding: 11px 38px 11px 13px;
  border: 1px solid var(--border-color);
  border-radius: 9px;
  background: var(--bg-card);
  color: var(--txt-primary);
  font: inherit;
  font-size: 13px;
}

.linprog-open {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 9px 16px;
  border-radius: 9px;
  background: linear-gradient(135deg, #2563eb, #0891b2);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

.linprog-picker-note {
  grid-column: 2 / 4;
  color: var(--txt-secondary);
  font-size: 11px;
}

.concept-question-picker {
  display: grid;
  grid-template-columns: minmax(140px, .8fr) minmax(180px, 1fr) auto;
  gap: 10px;
  align-items: center;
  margin-top: 18px;
  padding: 14px;
  border: 1px solid rgba(55, 65, 81, .8);
  border-radius: 12px;
  background: rgba(15, 23, 42, .5);
}

.concept-question-picker select {
  width: 100%;
  min-width: 0;
  padding: 10px 34px 10px 12px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: var(--bg-card);
  color: var(--txt-primary);
  font: inherit;
  font-size: 12px;
}

.concept-question-open {
  display: inline-flex;
  min-height: 39px;
  align-items: center;
  justify-content: center;
  padding: 8px 13px;
  border-radius: 8px;
  background: linear-gradient(135deg, #2563eb, #0891b2);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

.concept-picker-note {
  grid-column: 1 / -1;
  color: var(--txt-secondary);
  font-size: 10px;
}

.mini-ranking {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.mini-rank-row {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) 52px;
  gap: 10px;
  align-items: center;
}

.mini-rank-label {
  color: var(--txt-secondary);
  font-size: 11px;
}

.mini-rank-track {
  min-width: 0;
}

.mini-rank-name {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 4px;
  font-size: 12px;
}

.mini-rank-name span:first-child {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.mini-bar-track {
  height: 5px;
  overflow: hidden;
  border-radius: 999px;
  background: #1e293b;
}

.mini-bar {
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #2563eb, #06b6d4);
}

.mini-rank-value {
  color: var(--accent-cyan);
  font-size: 11px;
  font-weight: 800;
  text-align: right;
}

.year-focus-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.year-focus-card {
  padding: 14px;
  border: 1px solid rgba(55, 65, 81, .78);
  border-radius: 12px;
  background: rgba(15, 23, 42, .52);
}

.year-focus-card h4 {
  margin-bottom: 12px;
  color: #a5f3fc;
  font-size: 14px;
}

.year-chapter-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.year-chapter-name {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 5px;
  font-size: 11px;
}

.year-chapter-name span:first-child {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.year-chapter-name strong {
  color: var(--accent-cyan);
  white-space: nowrap;
}

.year-chapter-meta {
  margin-top: 4px;
  color: var(--txt-secondary);
  font-size: 10px;
}

.year-chapter-picker {
  display: grid;
  grid-template-columns: minmax(190px, 1fr) minmax(180px, 1fr) auto;
  gap: 10px;
  align-items: center;
  margin-top: 16px;
  padding: 14px;
  border: 1px solid rgba(55, 65, 81, .8);
  border-radius: 12px;
  background: rgba(15, 23, 42, .5);
}

.year-chapter-picker select {
  width: 100%;
  min-width: 0;
  padding: 10px 34px 10px 12px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: var(--bg-card);
  color: var(--txt-primary);
  font: inherit;
  font-size: 12px;
}

.year-chapter-open {
  display: inline-flex;
  min-height: 39px;
  align-items: center;
  justify-content: center;
  padding: 8px 13px;
  border-radius: 8px;
  background: linear-gradient(135deg, #2563eb, #0891b2);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

.year-chapter-note {
  grid-column: 1 / -1;
  color: var(--txt-secondary);
  font-size: 10px;
}

.year-chips,
.analysis-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.analysis-chip {
  max-width: 100%;
  overflow: hidden;
  padding: 4px 8px;
  border: 1px solid rgba(55, 65, 81, .9);
  border-radius: 7px;
  background: rgba(31, 41, 55, .62);
  color: #d1d5db;
  font-size: 11px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.analysis-empty {
  display: flex;
  min-height: 150px;
  align-items: center;
  justify-content: center;
  border: 1px dashed var(--border-color);
  border-radius: 12px;
  color: var(--txt-secondary);
  font-size: 13px;
  text-align: center;
}

/* 近三年・各章節分組長條圖（不顯示任何數字） */
.dist-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-bottom: 16px;
  font-size: 12px;
  color: var(--txt-secondary);
}
.dist-legend-item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}
.dist-legend-item i {
  width: 13px;
  height: 13px;
  border-radius: 3px;
}
.dist-plot {
  display: flex;
  align-items: stretch;
  gap: 8px;
  height: 188px;
  overflow-x: auto;
  padding-bottom: 6px;
}
.dist-group {
  display: flex;
  flex: 1 0 52px;
  min-width: 52px;
  flex-direction: column;
  align-items: center;
}
.dist-bars {
  display: flex;
  flex: 1 1 auto;
  align-items: flex-end;
  justify-content: center;
  gap: 3px;
  width: 100%;
  border-bottom: 1px solid rgba(55, 65, 81, .7);
}
.dist-bar {
  width: 10px;
  min-height: 1px;
  border-radius: 3px 3px 0 0;
  transition: height .45s ease-out;
}
.dist-label {
  margin-top: 8px;
  height: 30px;
  overflow: hidden;
  color: var(--txt-secondary);
  font-size: 10px;
  line-height: 1.25;
  text-align: center;
  word-break: break-word;
}
.dist-note {
  margin-top: 12px;
  color: var(--txt-secondary);
  font-size: 11px;
}

.trend-loading {
  padding: 44px;
  border: 1px dashed var(--border-color);
  border-radius: 16px;
  color: var(--txt-secondary);
  text-align: center;
}

@media (max-width: 820px) {
  .trend-page { padding: 30px 18px 60px; }
  .trend-hero { grid-template-columns: 1fr; align-items: start; }
  .trend-exam-tabs { width: 100%; }
  .trend-exam-tabs .tab-btn { flex: 1 1 30%; min-width: 94px; }
  .trend-scope { grid-template-columns: 1fr 1fr; }
  .trend-scope-main { grid-column: 1 / -1; }
  .trend-analysis-grid { grid-template-columns: 1fr; }
  .analysis-card--wide { grid-column: auto; }
  .year-focus-grid { grid-template-columns: 1fr; }
}

@media (max-width: 520px) {
  .trend-scope { grid-template-columns: 1fr; }
  .trend-scope-main { grid-column: auto; }
  .trend-group-heading { display: block; }
  .trend-group-heading p { margin-top: 5px; text-align: left; }
  .linprog-question-picker { grid-template-columns: 1fr; }
  .linprog-picker-note { grid-column: auto; }
  .linprog-open { width: 100%; }
  .concept-question-picker { grid-template-columns: 1fr; }
  .year-chapter-picker { grid-template-columns: 1fr; }
}

/* Heatmap Grid */
.heatmap-scroll {
  overflow-x: auto;
  margin-top: 12px;
}

.heatmap-table {
  border-collapse: collapse;
  width: 100%;
  min-width: 800px;
  font-size: 12px;
}

.heatmap-table th, .heatmap-table td {
  border: 1px solid var(--border-color);
  padding: 6px 4px;
  text-align: center;
}

.heatmap-table th {
  background-color: var(--bg-card);
  color: var(--txt-primary);
  font-weight: 600;
}

.heatmap-table td.row-header {
  text-align: left;
  font-weight: 600;
  background-color: var(--bg-card);
  width: 180px;
  max-width: 180px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.heatmap-cell {
  width: 20px;
  height: 20px;
  transition: background-color 0.2s;
}

.heatmap-cell.empty {
  background-color: #151c2c;
}

.heatmap-cell.present {
  background-color: var(--accent-cyan);
  box-shadow: 0 0 2px var(--accent-cyan);
  cursor: pointer;
}

/* Exam Coverage Grid Specific style */
.coverage-table {
  width: 100%;
  max-width: 600px;
  margin: 0 auto;
}

.coverage-table td.row-header {
  width: 100px;
}

/* Bar Chart */
.chart-container {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.chart-row {
  display: flex;
  align-items: center;
  font-size: 13px;
}

.chart-label {
  width: 220px;
  text-overflow: ellipsis;
  white-space: nowrap;
  overflow: hidden;
  padding-right: 12px;
}

.chart-bar-wrapper {
  flex-grow: 1;
  background-color: #151c2c;
  height: 20px;
  border-radius: 4px;
  overflow: hidden;
  position: relative;
}

.chart-bar {
  background: linear-gradient(to right, var(--accent), var(--accent-cyan));
  height: 100%;
  border-radius: 4px;
  transition: width 0.5s ease-out;
}

.chart-value {
  margin-left: 12px;
  width: 56px;
  text-align: right;
  font-weight: bold;
}

/* Landing chapter-frequency leaderboard */
.frequency-panel {
  position: relative;
  overflow: hidden;
  padding: 32px;
  background:
    radial-gradient(circle at 92% 4%, rgba(6, 182, 212, .12), transparent 35%),
    linear-gradient(145deg, rgba(17, 24, 39, .98), rgba(15, 23, 42, .98));
}

.frequency-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(148, 163, 184, .035) 1px, transparent 1px);
  background-size: 100% 42px;
}

.frequency-header,
.frequency-summary,
.frequency-tabs,
.frequency-chart,
.frequency-footer {
  position: relative;
  z-index: 1;
}

.frequency-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 24px;
}

.frequency-eyebrow {
  display: block;
  margin-bottom: 8px;
  color: var(--accent-cyan);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.frequency-title {
  margin: 0;
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1.2;
}

.frequency-desc {
  max-width: 560px;
  margin: 10px 0 0;
  color: var(--txt-secondary);
  font-size: 14px;
  line-height: 1.7;
}

.frequency-badge {
  flex: 0 0 auto;
  padding: 9px 13px;
  border: 1px solid rgba(6, 182, 212, .35);
  border-radius: 999px;
  background: rgba(6, 182, 212, .09);
  color: #a5f3fc;
  font-size: 12px;
  font-weight: 700;
  white-space: nowrap;
}

.frequency-summary {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 20px;
}

.frequency-stat {
  padding: 15px 16px;
  border: 1px solid rgba(55, 65, 81, .85);
  border-radius: 12px;
  background: rgba(31, 41, 55, .58);
}

.frequency-stat strong {
  display: block;
  color: var(--txt-primary);
  font-size: 20px;
  line-height: 1.25;
}

.frequency-stat span {
  display: block;
  margin-top: 5px;
  color: var(--txt-secondary);
  font-size: 12px;
}

.frequency-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 22px;
}

.frequency-tab {
  padding: 8px 14px;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  background: rgba(15, 23, 42, .68);
  color: var(--txt-secondary);
  font: inherit;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: border-color .2s, background-color .2s, color .2s, transform .2s;
}

.frequency-tab:hover {
  color: var(--txt-primary);
  border-color: #64748b;
  transform: translateY(-1px);
}

.frequency-tab.active {
  border-color: rgba(6, 182, 212, .55);
  background: linear-gradient(135deg, rgba(37, 99, 235, .28), rgba(6, 182, 212, .18));
  color: #ecfeff;
  box-shadow: inset 0 0 0 1px rgba(6, 182, 212, .08);
}

.frequency-chart {
  gap: 9px;
}

.frequency-row {
  display: grid;
  grid-template-columns: 30px minmax(130px, 220px) minmax(120px, 1fr) 92px;
  align-items: center;
  gap: 12px;
  min-height: 34px;
}

.frequency-rank {
  color: #64748b;
  font-size: 12px;
  font-weight: 800;
  text-align: center;
}

.frequency-row:nth-child(-n+3) .frequency-rank {
  color: var(--accent-cyan);
}

.frequency-name {
  min-width: 0;
  overflow: hidden;
  color: var(--txt-primary);
  font-size: 13px;
  font-weight: 650;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.frequency-track {
  height: 9px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(30, 41, 59, .95);
}

.frequency-bar {
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #2563eb, #06b6d4);
  box-shadow: 0 0 16px rgba(6, 182, 212, .22);
  transform-origin: left;
  animation: frequency-grow .55s ease-out both;
}

.frequency-count {
  color: var(--txt-secondary);
  font-size: 12px;
  text-align: right;
  white-space: nowrap;
}

.frequency-count strong {
  color: var(--txt-primary);
  font-size: 14px;
}

.frequency-footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 22px;
  padding-top: 16px;
  border-top: 1px solid rgba(55, 65, 81, .75);
  color: var(--txt-secondary);
  font-size: 12px;
  line-height: 1.6;
}

.frequency-footer a {
  color: var(--accent-cyan);
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

@keyframes frequency-grow {
  from { transform: scaleX(0); opacity: .35; }
  to { transform: scaleX(1); opacity: 1; }
}

@media (max-width: 720px) {
  .frequency-panel { padding: 24px 18px; }
  .frequency-header { display: block; }
  .frequency-badge { display: inline-block; margin-top: 16px; }
  .frequency-summary { grid-template-columns: 1fr; }
  .frequency-row {
    grid-template-columns: 26px minmax(0, 1fr) 92px;
    gap: 8px;
    padding: 7px 0;
  }
  .frequency-count { font-size: 11px; }
  .frequency-track {
    grid-column: 2 / 4;
    grid-row: 2;
  }
  .frequency-count {
    grid-column: 3;
    grid-row: 1;
  }
  .frequency-footer { display: block; }
  .frequency-footer a { display: inline-block; margin-top: 8px; }
}

/* Gap Topics Alert Grid */
.gap-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}

.gap-card {
  background-color: rgba(239, 68, 68, 0.05);
  border: 1px solid rgba(239, 68, 68, 0.2);
  border-radius: 8px;
  padding: 16px;
  font-size: 14px;
}

.gap-card h4 {
  color: var(--danger);
  margin-bottom: 6px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 6px;
}

.gap-card p {
  color: var(--txt-secondary);
  font-size: 12px;
}

/* Footer style */
footer.site-footer {
  background-color: var(--bg-panel);
  border-top: 1px solid var(--border-color);
  padding: 32px 20px;
  text-align: center;
  font-size: 13px;
  color: var(--txt-secondary);
}

footer.site-footer p {
  max-width: 800px;
  margin: 0 auto 12px;
  line-height: 1.6;
}

footer.site-footer .links {
  margin-top: 16px;
  display: flex;
  justify-content: center;
  gap: 16px;
}

footer.site-footer a {
  color: var(--accent-cyan);
  text-decoration: none;
}

/* ===== 題庫搜尋頁（RWD：手機/桌機皆置中、字級易讀） ===== */
.search-wrap {
  max-width: 1040px;
  margin: 0 auto;
  padding: 32px 20px 110px;
}
.search-wrap > h1 { font-size: 28px; font-weight: 800; margin-bottom: 10px; }
.search-intro { font-size: 15px; line-height: 1.7; color: var(--txt-secondary); margin-bottom: 24px; max-width: 760px; }

.track-label { font-size: 13px; color: var(--txt-secondary); margin-bottom: 8px; }
.track-bar { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
.track-btn {
  font-size: 15px; font-weight: 600;
  padding: 10px 20px; border-radius: 999px;
  background: var(--bg-card); color: var(--txt-secondary);
  border: 1px solid var(--border-color); cursor: pointer;
  transition: color .15s, border-color .15s, background .15s;
}
.track-btn:hover { color: var(--txt-primary); border-color: var(--accent); }
.track-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }

.search-controls { display: grid; grid-template-columns: 1fr; gap: 10px; margin-bottom: 16px; }
.search-controls input, .search-controls select {
  width: 100%; font-size: 15px; padding: 12px 14px;
  background: var(--bg-card); color: var(--txt-primary);
  border: 1px solid var(--border-color); border-radius: 8px;
  font-family: inherit;
}
.search-controls input::placeholder { color: var(--txt-secondary); }
.search-controls input:focus, .search-controls select:focus {
  outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow);
}
@media (min-width: 640px) { .search-controls { grid-template-columns: 2fr 1fr 1fr; } }

.result-count { font-size: 13px; color: var(--txt-secondary); margin-bottom: 14px; }

.acc-track {
  border: 1px solid var(--border-color); border-radius: 10px;
  margin-bottom: 12px; background: var(--bg-panel); overflow: hidden;
}
.acc-track > summary {
  list-style: none; cursor: pointer; display: flex; align-items: center; gap: 10px;
  padding: 15px 18px; font-size: 17px; font-weight: 700; color: var(--txt-primary);
}
.acc-track > summary::-webkit-details-marker { display: none; }
.acc-track > summary::before { content: "▸"; color: var(--accent-cyan); font-size: 13px; }
.acc-track[open] > summary::before { content: "▾"; }
.track-n { margin-left: auto; font-size: 13px; font-weight: 500; color: var(--txt-secondary); }

.acc-year { border-top: 1px solid var(--border-color); }
.acc-year > summary {
  list-style: none; cursor: pointer; display: flex; align-items: center; gap: 10px;
  padding: 12px 18px 12px 34px; font-size: 15px; font-weight: 600; color: var(--txt-primary);
}
.acc-year > summary::-webkit-details-marker { display: none; }
.acc-year > summary::before { content: "+"; color: var(--txt-secondary); width: 12px; }
.acc-year[open] > summary::before { content: "−"; }
.year-n { margin-left: auto; font-size: 12px; font-weight: 500; color: var(--txt-secondary); }
.badge-makeup {
  font-size: 11px; font-weight: 600; padding: 2px 8px; border-radius: 6px;
  background: rgba(245, 158, 11, 0.15); color: #f59e0b; border: 1px solid rgba(245, 158, 11, 0.35);
}

.q-row {
  display: flex; gap: 10px; align-items: flex-start;
  padding: 11px 18px 11px 34px; border-top: 1px solid rgba(255, 255, 255, 0.05);
}
.q-row.selected { background: rgba(37, 99, 235, 0.12); }
.q-check { margin-top: 3px; width: 16px; height: 16px; flex-shrink: 0; accent-color: var(--accent); cursor: pointer; }
.q-row-body { flex: 1; min-width: 0; }
.q-row-meta { display: inline-block; font-size: 14px; font-weight: 500; color: var(--txt-primary); text-decoration: none; }
.q-row-meta:hover { color: var(--accent-cyan); }
.q-open { color: var(--accent-cyan); }
.facet { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin-top: 6px; }
.flabel { color: var(--txt-secondary); font-size: 11px; min-width: 42px; }
.chip {
  font-size: 12px; padding: 2px 8px; border-radius: 6px;
  background: var(--bg-card); color: var(--txt-secondary); border: 1px solid var(--border-color);
}
.chip.ch { color: #93c5fd; border-color: rgba(147, 197, 253, 0.3); }
.chip.kn { color: #5eead4; border-color: rgba(94, 234, 212, 0.3); }
.chip.me { color: #c4b5fd; border-color: rgba(196, 181, 253, 0.3); }
.trust { font-size: 11px; color: var(--txt-secondary); }

.action-bar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 200;
  display: flex; flex-wrap: wrap; align-items: center; gap: 12px;
  padding: 12px 20px; background: var(--bg-panel); border-top: 1px solid var(--border-color);
}
.action-bar[hidden] { display: none; }
.ab-count { font-size: 14px; color: var(--txt-primary); }
.ab-mode { font-size: 13px; color: var(--txt-secondary); display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.ab-mode label { display: inline-flex; align-items: center; gap: 4px; cursor: pointer; }
.ab-actions { margin-left: auto; display: flex; gap: 8px; flex-wrap: wrap; }
.ab-btn {
  font-size: 14px; padding: 10px 16px; border-radius: 8px;
  background: var(--accent); color: #fff; border: none; cursor: pointer;
}
.ab-btn.ab-ghost { background: transparent; color: var(--txt-secondary); border: 1px solid var(--border-color); }
.ab-btn:hover { opacity: .9; }
.ab-mode label.disabled { opacity: .4; }
@media (max-width: 640px) {
  .ab-actions { margin-left: 0; width: 100%; }
  .ab-btn { flex: 1; }
}