/* ══════════════════════════════════════════════════════════════
   繁簡轉換練習 · 補充樣式
   琥珀金主題色 #D4A853，配合現有深色博物館設計系統
   ══════════════════════════════════════════════════════════════ */

:root {
  --gold:        #D4A853;
  --gold-2:      #E8C47A;
  --gold-soft:   rgba(212, 168, 83, 0.15);
  --gold-glow:   rgba(212, 168, 83, 0.35);
  --gold-border: rgba(212, 168, 83, 0.25);
  --correct:     #10B981;
  --correct-soft: rgba(16, 185, 129, 0.15);
  --wrong:       #EF4444;
  --wrong-soft:  rgba(239, 68, 68, 0.15);
}

/* ── 頁面標題 ───────────────────────────────────────────────── */
.cvt-title {
  background: linear-gradient(135deg, var(--gold-2) 0%, var(--gold) 50%, #C49842 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── 模式 Tabs ──────────────────────────────────────────────── */
.cvt-mode-tabs {
  display: flex;
  gap: 8px;
  max-width: 900px;
  margin: 0 auto 24px;
  padding: 0 24px;
}

.cvt-mode-tab {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: var(--surface);
  border: 1px solid var(--border-glass);
  border-radius: var(--r-md);
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s var(--ease);
  font-family: var(--font-sans);
  flex: 1;
  justify-content: center;
}

.cvt-mode-tab:hover {
  background: var(--surface-2);
  color: var(--ink);
  border-color: var(--gold-border);
}

.cvt-mode-tab.active {
  background: var(--gold-soft);
  border-color: var(--gold-border);
  color: var(--gold-2);
  box-shadow: 0 0 20px var(--gold-glow);
}

.cvt-mode-tab svg {
  opacity: 0.7;
}

.cvt-tab-count {
  font-size: 0.75rem;
  background: rgba(255,255,255,0.08);
  padding: 2px 8px;
  border-radius: 20px;
  color: var(--muted);
  font-weight: 400;
}

.cvt-mode-tab.active .cvt-tab-count {
  background: var(--gold-soft);
  color: var(--gold);
}

/* ── 控制欄 ────────────────────────────────────────────────── */
.cvt-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  max-width: 900px;
  margin: 0 auto 20px;
  padding: 0 24px;
  flex-wrap: wrap;
}

.cvt-controls-left {
  flex: 1;
}

.cvt-controls-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.cvt-filter-chips {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.cvt-chip {
  padding: 5px 14px;
  background: var(--surface);
  border: 1px solid var(--border-glass);
  border-radius: 20px;
  color: var(--muted);
  font-size: 0.82rem;
  cursor: pointer;
  transition: all 0.18s;
  font-family: var(--font-sans);
  font-weight: 400;
}

.cvt-chip:hover {
  background: var(--surface-2);
  color: var(--ink);
}

.cvt-chip.active {
  background: var(--gold-soft);
  border-color: var(--gold-border);
  color: var(--gold-2);
}

/* unseen = accent, wrong = red, mastered = green */
.cvt-chip[data-filter="wrong"].active {
  background: var(--red-soft);
  border-color: rgba(239,68,68,0.3);
  color: #F87171;
}
.cvt-chip[data-filter="mastered"].active {
  background: var(--green-soft);
  border-color: rgba(16,185,129,0.3);
  color: #34D399;
}

.btn-danger-ghost {
  color: #F87171;
  border-color: rgba(239,68,68,0.2);
}
.btn-danger-ghost:hover {
  background: var(--wrong-soft);
  border-color: rgba(239,68,68,0.4);
}

/* ── 進度條 ─────────────────────────────────────────────────── */
.cvt-progress-area {
  max-width: 900px;
  margin: 0 auto 28px;
  padding: 0 24px;
}

.cvt-progress-bar-wrap {}

.cvt-progress-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
  font-size: 0.84rem;
  color: var(--muted);
}

.cvt-progress-badges {
  display: flex;
  gap: 10px;
}

.cvt-badge {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.78rem;
}

.cvt-badge-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
}

.cvt-badge-dot.mastered { background: var(--correct); }
.cvt-badge-dot.wrong    { background: var(--wrong); }
.cvt-badge-dot.unseen   { background: rgba(255,255,255,0.2); }

.cvt-progress-track {
  height: 4px;
  background: rgba(255,255,255,0.07);
  border-radius: 2px;
  overflow: hidden;
}

.cvt-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--gold) 0%, var(--gold-2) 100%);
  border-radius: 2px;
  transition: width 0.5s var(--ease);
}

/* ── 瀏覽網格（學習模式）────────────────────────────────────── */
.cvt-grid-section {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

.cvt-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
}

/* Single-char mode: smaller cards */
.cvt-grid.char-mode {
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
}

.cvt-item {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border-glass);
  border-radius: var(--r-md);
  padding: 16px;
  cursor: pointer;
  transition: all 0.2s var(--ease);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  text-align: center;
  user-select: none;
}

.cvt-item:hover {
  background: var(--surface-2);
  border-color: var(--gold-border);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm), 0 0 16px var(--gold-glow);
}

/* Status indicators */
.cvt-item.status-mastered {
  border-color: rgba(16,185,129,0.25);
}
.cvt-item.status-mastered::after {
  content: '✓';
  position: absolute;
  top: 6px;
  right: 8px;
  font-size: 0.65rem;
  color: var(--correct);
  font-weight: 700;
}

.cvt-item.status-wrong {
  border-color: rgba(239,68,68,0.25);
}
.cvt-item.status-wrong::after {
  content: '✗';
  position: absolute;
  top: 6px;
  right: 8px;
  font-size: 0.7rem;
  color: var(--wrong);
  font-weight: 700;
}

.cvt-simp {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  color: var(--ink);
  font-weight: 500;
}

.cvt-arrow {
  font-size: 0.75rem;
  color: var(--gold);
  opacity: 0.7;
}

.cvt-trad {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  color: var(--gold-2);
  font-weight: 600;
  transition: all 0.2s;
}

/* Test mode: hide trad by default, show on hover/click */
.test-mode .cvt-trad {
  opacity: 0;
  filter: blur(6px);
}

.test-mode .cvt-item:hover .cvt-trad,
.test-mode .cvt-item.revealed .cvt-trad {
  opacity: 1;
  filter: blur(0);
}

.cvt-item-label {
  font-size: 0.7rem;
  color: var(--muted);
  margin-top: 2px;
}

/* Char mode cards */
.cvt-item.char-item .cvt-simp {
  font-size: 2rem;
}

.cvt-item.char-item .cvt-trad {
  font-size: 2rem;
}

.cvt-item.char-item .cvt-alts {
  font-size: 0.78rem;
  color: var(--muted);
}

/* ── 測驗卡片（Flash Card）───────────────────────────────────── */
.cvt-quiz-section {
  max-width: 600px;
  margin: 0 auto 40px;
  padding: 0 24px;
}

.cvt-card {
  background: var(--surface);
  border: 1px solid var(--gold-border);
  border-radius: var(--r-xl);
  padding: 48px 40px 40px;
  min-height: 320px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  box-shadow: var(--shadow-md), 0 0 40px var(--gold-glow);
  transition: all 0.3s var(--ease);
  position: relative;
}

.cvt-card.correct {
  border-color: rgba(16,185,129,0.5);
  box-shadow: var(--shadow-md), 0 0 40px rgba(16,185,129,0.2);
}

.cvt-card.wrong-ans {
  border-color: rgba(239,68,68,0.5);
  box-shadow: var(--shadow-md), 0 0 40px rgba(239,68,68,0.2);
  animation: shake 0.4s ease;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%       { transform: translateX(-8px); }
  40%       { transform: translateX(8px); }
  60%       { transform: translateX(-5px); }
  80%       { transform: translateX(5px); }
}

.cvt-card-prompt {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 20px;
  letter-spacing: 0.05em;
}

.cvt-card-question {
  font-family: var(--font-serif);
  font-size: 3.5rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 8px;
  line-height: 1.2;
}

.cvt-card-hint {
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 32px;
}

/* Options */
.cvt-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  width: 100%;
  max-width: 420px;
}

.cvt-option {
  padding: 14px 16px;
  background: var(--surface-2);
  border: 1px solid var(--border-glass);
  border-radius: var(--r-md);
  font-family: var(--font-serif);
  font-size: 1.4rem;
  color: var(--ink);
  cursor: pointer;
  transition: all 0.18s;
  position: relative;
  overflow: hidden;
  font-weight: 500;
}

.cvt-option:hover:not(:disabled) {
  background: var(--surface-3);
  border-color: var(--gold-border);
  transform: translateY(-1px);
}

.cvt-option.opt-correct {
  background: var(--correct-soft);
  border-color: rgba(16,185,129,0.5);
  color: #34D399;
}

.cvt-option.opt-wrong {
  background: var(--wrong-soft);
  border-color: rgba(239,68,68,0.4);
  color: #F87171;
}

.cvt-option:disabled {
  cursor: default;
}

/* Feedback row */
.cvt-feedback {
  margin-top: 20px;
  font-size: 0.9rem;
  min-height: 28px;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

.cvt-feedback.correct { color: #34D399; }
.cvt-feedback.wrong   { color: #F87171; }

/* Mark buttons */
.cvt-mark-row {
  display: flex;
  gap: 8px;
  margin-top: 16px;
}

.cvt-mark-btn {
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.78rem;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.18s;
  font-family: var(--font-sans);
}

.cvt-mark-known {
  background: var(--correct-soft);
  border-color: rgba(16,185,129,0.3);
  color: #34D399;
}
.cvt-mark-known:hover {
  background: rgba(16,185,129,0.25);
}

.cvt-mark-flag {
  background: var(--wrong-soft);
  border-color: rgba(239,68,68,0.3);
  color: #F87171;
}
.cvt-mark-flag:hover {
  background: rgba(239,68,68,0.2);
}

/* Card nav */
.cvt-card-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 20px;
}

.cvt-card-counter {
  font-size: 0.85rem;
  color: var(--muted);
  min-width: 60px;
  text-align: center;
}

/* ── 空狀態 ─────────────────────────────────────────────────── */
.cvt-empty {
  text-align: center;
  padding: 64px 24px;
  color: var(--muted);
}

.cvt-empty-icon {
  font-size: 3rem;
  margin-bottom: 12px;
}

/* ── 測驗總結 ────────────────────────────────────────────────── */
.cvt-summary {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.8);
  backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 500;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.cvt-summary-inner {
  background: var(--surface-2);
  border: 1px solid var(--gold-border);
  border-radius: var(--r-xl);
  padding: 48px;
  max-width: 480px;
  width: 90%;
  text-align: center;
  box-shadow: var(--shadow-lg), 0 0 60px var(--gold-glow);
}

.cvt-summary-icon {
  font-size: 3.5rem;
  margin-bottom: 16px;
}

.cvt-summary-inner h2 {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  color: var(--gold-2);
  margin-bottom: 28px;
}

.cvt-summary-stats {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px;
  margin-bottom: 32px;
}

.cvt-stat {
  background: var(--surface);
  border-radius: var(--r-md);
  padding: 16px 12px;
  border: 1px solid var(--border-glass);
}

.cvt-stat-num {
  font-size: 2rem;
  font-weight: 700;
  font-family: var(--font-sans);
  margin-bottom: 4px;
}

.cvt-stat-num.green { color: #34D399; }
.cvt-stat-num.red   { color: #F87171; }
.cvt-stat-num.gold  { color: var(--gold-2); }

.cvt-stat-label {
  font-size: 0.75rem;
  color: var(--muted);
}

.cvt-summary-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
}

/* ── 響應式 ─────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .cvt-mode-tabs {
    padding: 0 16px;
  }
  .cvt-controls {
    padding: 0 16px;
    flex-direction: column;
    align-items: flex-start;
  }
  .cvt-grid-section {
    padding: 0 16px 60px;
  }
  .cvt-grid {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  }
  .cvt-grid.char-mode {
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  }
  .cvt-card {
    padding: 32px 24px 28px;
  }
  .cvt-card-question {
    font-size: 2.8rem;
  }
  .cvt-options {
    grid-template-columns: 1fr 1fr;
  }
  .cvt-option {
    font-size: 1.2rem;
    padding: 12px;
  }
  .cvt-summary-stats {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

/* ══════════════════════════════════════════════════════════════
   繁簡轉換頁：金色主題覆蓋（優先於 style.css 翠玉主題）
   ══════════════════════════════════════════════════════════════ */

/* 標題裝飾分隔線 → 琥珀金 */
.page-header::after {
  background: linear-gradient(90deg, transparent, var(--gold), var(--gold-2), transparent);
  box-shadow: 0 0 10px var(--gold-glow);
}

/* Notice Banner → 琥珀金 */
.notice-banner {
  background: linear-gradient(to right, var(--gold-soft), rgba(212, 168, 83, 0.04));
  border: 1px solid var(--gold-border);
  border-left: 4px solid var(--gold);
}

/* ── 歡迎回來提示橫幅 ───────────────────────────────────────── */
.cvt-welcome-banner {
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 900px;
  margin: 0 auto 20px;
  padding: 14px 20px;
  background: linear-gradient(135deg, var(--gold-soft), rgba(212, 168, 83, 0.06));
  border: 1px solid var(--gold-border);
  border-radius: var(--r-md);
  font-size: 14px;
  color: var(--gold-2);
  animation: fadeUp 0.5s var(--ease) both;
}
.cvt-welcome-icon {
  font-size: 20px;
  flex-shrink: 0;
}
.cvt-welcome-text strong {
  color: var(--gold);
}