/* ============================================================
   Word Wave 英語 A1-B1 詞彙學習系統 — 全域設計系統
   Design System: Dark Glassmorphism（沿用自 04_Tool_Truku_language_learning_app，
   純視覺設計系統跟內容無關，直接複用）
   系統字體堆疊，不依賴 Google Fonts CDN，支援完全離線的 PWA 安裝與使用。
   ============================================================ */

/* ────────────────────────────────────────────────────────────
   1. CSS 自訂屬性（Design Tokens）
   ──────────────────────────────────────────────────────────── */
:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang TC",
    "Noto Sans TC", "Microsoft JhengHei", Roboto, sans-serif;

  /* 主色系：太魯閣山林 */
  --color-bg-start:       hsl(220, 45%, 8%);
  --color-bg-mid:         hsl(215, 40%, 12%);
  --color-bg-end:         hsl(200, 35%, 9%);

  /* 玻璃卡片 */
  --glass-bg:             rgba(255, 255, 255, 0.05);
  --glass-bg-hover:       rgba(255, 255, 255, 0.09);
  --glass-border:         rgba(255, 255, 255, 0.12);
  --glass-border-active:  rgba(255, 190, 80, 0.45);
  --glass-shadow:         0 8px 32px rgba(0, 0, 0, 0.45);
  --glass-shadow-hover:   0 16px 48px rgba(0, 0, 0, 0.6);

  /* 主題色：琥珀橙（太魯閣傳統紋樣）*/
  --amber:                hsl(33, 90%, 55%);
  --amber-light:          hsl(38, 95%, 68%);
  --amber-dark:           hsl(28, 85%, 42%);
  --amber-glow:           rgba(255, 160, 50, 0.2);

  /* 輔助色 */
  --sky:                  hsl(200, 80%, 58%);
  --sky-dark:             hsl(205, 75%, 38%);
  --mint:                 hsl(160, 65%, 52%);
  --rose:                 hsl(355, 75%, 58%);
  --gold:                 hsl(45, 90%, 60%);

  /* Echo 狀態色 */
  --state-idle:           rgba(120, 130, 150, 0.15);
  --state-listen:         rgba(30, 140, 220, 0.20);
  --state-echo:           rgba(255, 140, 40, 0.22);
  --state-record:         rgba(220, 50, 70, 0.22);
  --state-ready:          rgba(50, 200, 130, 0.20);

  /* 文字 */
  --text-primary:         hsl(220, 20%, 95%);
  --text-secondary:       hsl(220, 15%, 65%);
  --text-muted:           hsl(220, 10%, 42%);

  /* 尺寸 */
  --radius-sm:            8px;
  --radius-md:            14px;
  --radius-lg:            20px;
  --radius-xl:            28px;
  --radius-pill:          999px;

  /* 動畫 */
  --ease-bounce:          cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-smooth:          cubic-bezier(0.4, 0, 0.2, 1);
  --duration-fast:        150ms;
  --duration-base:        280ms;
  --duration-slow:        500ms;
  --duration-flip:        600ms;
}

/* ────────────────────────────────────────────────────────────
   2. Reset & 基礎設定
   ──────────────────────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-tap-highlight-color: transparent;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: linear-gradient(135deg,
    var(--color-bg-start) 0%,
    var(--color-bg-mid)   50%,
    var(--color-bg-end)   100%);
  background-attachment: fixed;
  color: var(--text-primary);
  min-height: 100dvh;
  line-height: 1.55;
  overflow-x: hidden;
}

/* 背景裝飾光暈 */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 20% 10%, rgba(255, 140, 40, 0.07) 0%, transparent 70%),
    radial-gradient(ellipse 50% 60% at 80% 85%, rgba(30, 140, 220, 0.07) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

/* ────────────────────────────────────────────────────────────
   3. 佈局容器
   ──────────────────────────────────────────────────────────── */
.app-wrapper {
  position: relative;
  z-index: 1;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  max-width: 520px;
  margin: 0 auto;
  padding: 0 16px 96px;
}

/* ────────────────────────────────────────────────────────────
   4. 玻璃態卡片 (Glassmorphism)
   ──────────────────────────────────────────────────────────── */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(18px) saturate(180%);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--glass-shadow);
  transition:
    box-shadow var(--duration-base) var(--ease-smooth),
    border-color var(--duration-base) var(--ease-smooth),
    background var(--duration-base) var(--ease-smooth);
}

.glass-card:hover {
  background: var(--glass-bg-hover);
  box-shadow: var(--glass-shadow-hover);
}

/* ────────────────────────────────────────────────────────────
   4b. iframe逃逸提示（在HF展示頁被嵌入時顯示，見 index.html 開頭的說明）
   ──────────────────────────────────────────────────────────── */
.iframe-escape-banner {
  position: sticky;
  top: 0;
  z-index: 999;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: linear-gradient(90deg, var(--sky-dark), var(--sky));
  color: #fff;
  font-size: 0.82rem;
  text-align: center;
}

.iframe-escape-url {
  font-size: 0.76rem;
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  background: rgba(0, 0, 0, 0.2);
  color: #fff;
  word-break: break-all;
  user-select: all;
  -webkit-user-select: all;
}

.iframe-escape-banner button {
  flex-shrink: 0;
  padding: 6px 14px;
  border: none;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.22);
  color: #fff;
  font-weight: 600;
  font-size: 0.8rem;
  cursor: pointer;
  white-space: nowrap;
}

.iframe-escape-banner button:hover {
  background: rgba(255, 255, 255, 0.34);
}

.iframe-escape-banner a:hover {
  background: rgba(255, 255, 255, 0.32);
}

/* ────────────────────────────────────────────────────────────
   5. 頂部導覽列
   ──────────────────────────────────────────────────────────── */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0 16px;
  gap: 12px;
}

.app-logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.app-logo .logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--amber), var(--amber-light));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  box-shadow: 0 4px 12px var(--amber-glow);
  flex-shrink: 0;
}

.app-logo .logo-text {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
}

.app-logo .logo-sub {
  font-size: 0.7rem;
  font-weight: 400;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

/* ────────────────────────────────────────────────────────────
   6. 頁面視圖管理
   ──────────────────────────────────────────────────────────── */
.view {
  display: none;
  animation: fadeInUp var(--duration-base) var(--ease-smooth) both;
}

.view.active {
  display: block;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ────────────────────────────────────────────────────────────
   7. 首頁（Home View）
   ──────────────────────────────────────────────────────────── */
.hero-section {
  text-align: center;
  padding: 32px 0 24px;
}

.hero-section h1 {
  font-size: clamp(1.8rem, 6vw, 2.4rem);
  font-weight: 800;
  background: linear-gradient(135deg, var(--amber-light), var(--amber), var(--sky));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
  margin-bottom: 10px;
}

.hero-section p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  max-width: 320px;
  margin: 0 auto 28px;
}

/* 統計徽章列 */
.stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 24px;
}

.stat-card {
  padding: 14px 10px;
  text-align: center;
}

.stat-value {
  font-size: 1.6rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--amber-light), var(--amber));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}

.stat-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 4px;
  font-weight: 500;
  letter-spacing: 0.03em;
}

/* 快速開始按鈕群 */
.quick-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}

.action-card {
  padding: 18px 20px;
  display: flex;
  align-items: center;
  gap: 14px;
  cursor: pointer;
  text-align: left;
  transition:
    transform var(--duration-fast) var(--ease-bounce),
    border-color var(--duration-base) var(--ease-smooth);
}

.action-card:hover,
.action-card:active {
  transform: translateY(-2px) scale(1.01);
  border-color: var(--glass-border-active);
}

.action-card .action-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}

.action-card .action-icon.amber  { background: linear-gradient(135deg, var(--amber-dark), var(--amber)); box-shadow: 0 4px 14px var(--amber-glow); }
.action-card .action-icon.sky    { background: linear-gradient(135deg, var(--sky-dark), var(--sky)); box-shadow: 0 4px 14px rgba(30,140,220,0.25); }
.action-card .action-icon.mint   { background: linear-gradient(135deg, hsl(160,65%,35%), var(--mint)); box-shadow: 0 4px 14px rgba(50,200,130,0.22); }
.action-card .action-icon.rose   { background: linear-gradient(135deg, hsl(355,75%,42%), var(--rose)); box-shadow: 0 4px 14px rgba(220,50,70,0.22); }
.action-card .action-icon.gold   { background: linear-gradient(135deg, hsl(45,80%,38%), var(--gold)); box-shadow: 0 4px 14px rgba(230,190,60,0.22); }

.action-card .action-info h3 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.action-card .action-info p {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.action-card .action-arrow {
  margin-left: auto;
  color: var(--text-muted);
  font-size: 1rem;
  transition: transform var(--duration-fast) var(--ease-smooth);
}

.action-card:hover .action-arrow {
  transform: translateX(4px);
  color: var(--amber);
}

/* ────────────────────────────────────────────────────────────
   8. 篩選與模式選擇列
   ──────────────────────────────────────────────────────────── */
.filter-bar {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  overflow-x: auto;
  padding-bottom: 2px;
  scrollbar-width: none;
}

.filter-bar::-webkit-scrollbar { display: none; }

.filter-chip {
  flex-shrink: 0;
  padding: 7px 14px;
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  font-weight: 500;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--text-secondary);
  cursor: pointer;
  transition:
    background var(--duration-fast) var(--ease-smooth),
    border-color var(--duration-fast) var(--ease-smooth),
    color var(--duration-fast) var(--ease-smooth);
  white-space: nowrap;
  backdrop-filter: blur(8px);
}

.filter-chip:hover {
  background: var(--glass-bg-hover);
  color: var(--text-primary);
}

.filter-chip.active {
  background: linear-gradient(135deg, var(--amber-dark), var(--amber));
  border-color: var(--amber);
  color: #fff;
  font-weight: 600;
  box-shadow: 0 2px 10px var(--amber-glow);
}

/* Select 下拉 */
.glass-select {
  flex: 1;
  padding: 9px 12px;
  border-radius: var(--radius-md);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  cursor: pointer;
  outline: none;
  transition: border-color var(--duration-fast) var(--ease-smooth);
}

.glass-select:focus {
  border-color: var(--amber);
}

.glass-select option {
  background: hsl(220, 40%, 15%);
  color: var(--text-primary);
}

/* AI發音 男聲/女聲 快速切換（跟首頁設定的 ttsVoiceSelect 同步同一個全域偏好） */
.voice-toggle-row {
  display: flex;
  align-items: center;
  gap: 6px;
}

.voice-toggle-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-right: 2px;
  white-space: nowrap;
}

.voice-toggle-row .voice-toggle-btn {
  padding: 5px 10px;
  font-size: 0.75rem;
}

/* 情境例句／閱讀故事 詳情頁標題列的工具列（顯示中文切換 + 語音切換），跟 view-header 同一列，空間不夠會自動換行 */
.detail-toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-left: auto;
}

.zh-toggle-btn {
  padding: 5px 10px;
  font-size: 0.75rem;
  white-space: nowrap;
}

/* 中文預設隱藏（自我測驗模式：先看英文，按「顯示中文」才整批出現） */
.unit-sentence-list.zh-hidden .sentence-zh,
.story-sentence-list.zh-hidden .sentence-zh {
  display: none;
}

/* ────────────────────────────────────────────────────────────
   9. 進度列
   ──────────────────────────────────────────────────────────── */
.progress-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.progress-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
}

.progress-count {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--amber);
}

.progress-track {
  width: 100%;
  height: 4px;
  background: rgba(255,255,255,0.08);
  border-radius: var(--radius-pill);
  overflow: hidden;
  margin-bottom: 20px;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--amber-dark), var(--amber-light));
  border-radius: var(--radius-pill);
  transition: width var(--duration-slow) var(--ease-smooth);
  box-shadow: 0 0 8px var(--amber-glow);
}

/* ────────────────────────────────────────────────────────────
   10. 3D 翻轉字卡
   ──────────────────────────────────────────────────────────── */
.card-viewport {
  perspective: 1200px;
  width: 100%;
  height: 340px;
  margin-bottom: 16px;
}

.card-flipper {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform var(--duration-flip) var(--ease-smooth);
  cursor: pointer;
}

.card-viewport.flipped .card-flipper {
  transform: rotateY(180deg);
}

.card-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--radius-xl);
  padding: 24px 22px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  overflow: hidden;
}

/* 正面 */
.card-front {
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(200%);
  -webkit-backdrop-filter: blur(20px) saturate(200%);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}

.card-front::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -30%;
  width: 250px;
  height: 250px;
  background: radial-gradient(circle, rgba(255,160,50,0.12) 0%, transparent 70%);
  pointer-events: none;
}

/* 背面 */
.card-back {
  background: linear-gradient(145deg,
    rgba(255, 160, 50, 0.08) 0%,
    rgba(30, 120, 200, 0.08) 100%);
  backdrop-filter: blur(20px) saturate(200%);
  -webkit-backdrop-filter: blur(20px) saturate(200%);
  border: 1px solid var(--glass-border-active);
  box-shadow: var(--glass-shadow), 0 0 0 1px rgba(255,160,50,0.1) inset;
  transform: rotateY(180deg);
}

/* 卡片內容 */
.card-tag {
  align-self: flex-start;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: rgba(255,160,50,0.15);
  border: 1px solid rgba(255,160,50,0.3);
  color: var(--amber-light);
}

.card-tag.sentence {
  background: rgba(30,140,220,0.15);
  border-color: rgba(30,140,220,0.3);
  color: var(--sky);
}

.card-main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  text-align: center;
  width: 100%;
}

.card-truku {
  font-size: clamp(1.8rem, 8vw, 2.4rem);
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  line-height: 1.2;
}

/* 聽力模式：隱藏文字 */
.listening-mode .card-truku {
  filter: blur(12px);
  user-select: none;
}

.card-phonetic {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-style: italic;
  font-weight: 400;
}

.card-zh {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 8px 0 4px;
}

.card-sentence-box {
  width: 100%;
  padding: 12px 14px;
  background: rgba(255,255,255,0.04);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--amber);
  text-align: left;
  margin-top: 8px;
}

.card-sentence-truku {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 3px;
}

.card-sentence-zh {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.card-source {
  font-size: 0.68rem;
  color: var(--text-muted);
  background: rgba(255,255,255,0.06);
  padding: 3px 9px;
  border-radius: var(--radius-pill);
  margin-top: 6px;
  display: inline-block;
}

/* SRS 數據 */
.card-srs-data {
  width: 100%;
  display: flex;
  gap: 6px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 8px;
}

.srs-badge {
  font-size: 0.68rem;
  padding: 3px 8px;
  border-radius: var(--radius-pill);
  background: rgba(255,255,255,0.06);
  color: var(--text-muted);
  border: 1px solid rgba(255,255,255,0.08);
}

.srs-badge strong { color: var(--amber-light); }

.card-flip-hint {
  font-size: 0.72rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 5px;
  align-self: flex-end;
}

/* ────────────────────────────────────────────────────────────
   11. 回聲法狀態橫幅
   ──────────────────────────────────────────────────────────── */
.echo-status {
  padding: 12px 16px;
  border-radius: var(--radius-md);
  text-align: center;
  font-weight: 600;
  font-size: 0.88rem;
  margin-bottom: 14px;
  transition: all var(--duration-base) var(--ease-smooth);
  border: 1px solid transparent;
}

.echo-status.idle     { background: var(--state-idle);   border-color: rgba(120,130,150,0.2); color: var(--text-secondary); }
.echo-status.listening{ background: var(--state-listen); border-color: rgba(30,140,220,0.3);  color: hsl(200,90%,78%); }
.echo-status.echo     { background: var(--state-echo);   border-color: rgba(255,140,40,0.3);  color: hsl(33,100%,75%); animation: pulse-glow 1.1s infinite; }
.echo-status.recording{ background: var(--state-record); border-color: rgba(220,50,70,0.3);   color: hsl(355,90%,75%); animation: pulse-glow 0.7s infinite; }
.echo-status.ready    { background: var(--state-ready);  border-color: rgba(50,200,130,0.3);  color: hsl(160,75%,72%); }

@keyframes pulse-glow {
  0%, 100% { opacity: 0.7; transform: scale(1); }
  50%       { opacity: 1;   transform: scale(1.005); }
}

/* ────────────────────────────────────────────────────────────
   12. 按鈕系統
   ──────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 12px 18px;
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition:
    transform var(--duration-fast) var(--ease-bounce),
    box-shadow var(--duration-fast) var(--ease-smooth),
    opacity var(--duration-fast);
  white-space: nowrap;
}

.btn:active { transform: scale(0.96); }
.btn:disabled { opacity: 0.35; cursor: not-allowed; }
.btn:disabled:active { transform: none; }

/* 主要按鈕 */
.btn-primary {
  background: linear-gradient(135deg, var(--amber-dark), var(--amber));
  color: #fff;
  box-shadow: 0 4px 14px var(--amber-glow);
  width: 100%;
}

.btn-primary:hover:not(:disabled) {
  box-shadow: 0 6px 20px rgba(255,160,50,0.35);
  transform: translateY(-1px);
}

/* 次要按鈕 */
.btn-secondary {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-secondary);
  backdrop-filter: blur(10px);
  width: 100%;
}

.btn-secondary:hover:not(:disabled) {
  background: var(--glass-bg-hover);
  color: var(--text-primary);
  border-color: rgba(255,255,255,0.2);
}

/* 導覽按鈕 */
.btn-nav {
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--glass-border);
  color: var(--text-secondary);
  flex: 1;
  padding: 10px 12px;
  font-size: 0.85rem;
}

.btn-nav:hover:not(:disabled) {
  background: rgba(255,255,255,0.1);
  color: var(--text-primary);
}

/* 評分按鈕 */
.btn-rate {
  flex: 1;
  color: #fff;
  font-size: 0.82rem;
  padding: 11px 8px;
  font-weight: 700;
}

.btn-rate.again  { background: linear-gradient(135deg, hsl(355,75%,42%), hsl(355,75%,55%)); box-shadow: 0 3px 10px rgba(220,50,70,0.25); }
.btn-rate.hard   { background: linear-gradient(135deg, hsl(30,75%,42%),  hsl(33,85%,58%));  box-shadow: 0 3px 10px rgba(255,140,40,0.25); }
.btn-rate.easy   { background: linear-gradient(135deg, hsl(160,60%,32%), hsl(160,65%,48%)); box-shadow: 0 3px 10px rgba(50,200,130,0.22); }

.btn-rate:hover:not(:disabled) { transform: translateY(-2px); }

/* ────────────────────────────────────────────────────────────
   13. 控制面板（卡片操作區）
   ──────────────────────────────────────────────────────────── */
.control-panel {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 14px;
}

.btn-group-echo {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.nav-row {
  display: flex;
  gap: 8px;
}

.rating-row {
  display: flex;
  gap: 7px;
  padding-top: 12px;
  border-top: 1px solid rgba(255,255,255,0.07);
}

/* ────────────────────────────────────────────────────────────
   14. Dashboard 儀表板
   ──────────────────────────────────────────────────────────── */
.dashboard-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 16px;
}

.dash-card {
  padding: 16px;
  text-align: center;
}

.dash-value {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1;
  background: linear-gradient(135deg, var(--amber-light), var(--amber));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.dash-value.sky  { background: linear-gradient(135deg, var(--sky), hsl(200,90%,75%)); -webkit-background-clip: text; background-clip: text; }
.dash-value.mint { background: linear-gradient(135deg, var(--mint), hsl(160,75%,72%)); -webkit-background-clip: text; background-clip: text; }
.dash-value.rose { background: linear-gradient(135deg, var(--rose), hsl(355,90%,72%)); -webkit-background-clip: text; background-clip: text; }

.dash-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-top: 4px;
  letter-spacing: 0.03em;
}

/* 圖表區 */
.chart-section {
  padding: 18px;
  margin-bottom: 14px;
}

.chart-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 7px;
}

.chart-title::before {
  content: '';
  width: 3px;
  height: 14px;
  background: var(--amber);
  border-radius: 2px;
}

.chart-wrap {
  height: 160px;
  position: relative;
}

/* 熱力圖（GitHub 風格） */
.heatmap-section {
  padding: 18px;
  margin-bottom: 14px;
}

.heatmap-grid {
  display: grid;
  grid-template-columns: repeat(13, 1fr);
  gap: 3px;
  margin-top: 10px;
}

.heatmap-cell {
  aspect-ratio: 1;
  border-radius: 2px;
  background: rgba(255,255,255,0.05);
  transition: background var(--duration-fast);
}

.heatmap-cell[data-level="1"] { background: rgba(255,160,50,0.20); }
.heatmap-cell[data-level="2"] { background: rgba(255,160,50,0.40); }
.heatmap-cell[data-level="3"] { background: rgba(255,160,50,0.65); }
.heatmap-cell[data-level="4"] { background: rgba(255,160,50,0.90); }

.heatmap-legend {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-top: 8px;
  justify-content: flex-end;
}

.heatmap-legend span {
  font-size: 0.65rem;
  color: var(--text-muted);
}

.legend-cell {
  width: 10px;
  height: 10px;
  border-radius: 2px;
}

/* ────────────────────────────────────────────────────────────
   15. 底部導覽列
   ──────────────────────────────────────────────────────────── */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 520px;
  padding: 10px 20px calc(10px + env(safe-area-inset-bottom));
  background: rgba(10, 14, 25, 0.85);
  backdrop-filter: blur(20px) saturate(200%);
  -webkit-backdrop-filter: blur(20px) saturate(200%);
  border-top: 1px solid rgba(255,255,255,0.08);
  display: flex;
  justify-content: space-around;
  z-index: 100;
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 6px 14px;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-smooth);
  min-width: 60px;
}

.nav-item:hover {
  background: rgba(255,255,255,0.06);
}

.nav-item.active {
  background: rgba(255,160,50,0.12);
}

.nav-item .nav-icon {
  font-size: 1.25rem;
  transition: transform var(--duration-fast) var(--ease-bounce);
}

.nav-item.active .nav-icon {
  transform: scale(1.15);
}

.nav-item .nav-label {
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.03em;
}

.nav-item.active .nav-label {
  color: var(--amber);
}

/* ────────────────────────────────────────────────────────────
   16. 徽章 & 標籤
   ──────────────────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  font-size: 0.7rem;
  font-weight: 600;
}

.badge-amber { background: rgba(255,160,50,0.15); color: var(--amber-light); border: 1px solid rgba(255,160,50,0.25); }
.badge-sky   { background: rgba(30,140,220,0.15);  color: var(--sky);         border: 1px solid rgba(30,140,220,0.25); }
.badge-mint  { background: rgba(50,200,130,0.15); color: var(--mint);         border: 1px solid rgba(50,200,130,0.25); }

/* 通知 Toast */
.toast {
  position: fixed;
  bottom: 90px;
  left: 50%;
  transform: translateX(-50%) translateY(12px);
  background: rgba(30, 36, 55, 0.95);
  backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-pill);
  padding: 10px 18px;
  font-size: 0.85rem;
  color: var(--text-primary);
  white-space: nowrap;
  opacity: 0;
  transition: all var(--duration-base) var(--ease-smooth);
  pointer-events: none;
  z-index: 200;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ────────────────────────────────────────────────────────────
   17. 載入動畫
   ──────────────────────────────────────────────────────────── */
.loading-spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255,160,50,0.2);
  border-top-color: var(--amber);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.skeleton {
  background: linear-gradient(90deg,
    rgba(255,255,255,0.05) 25%,
    rgba(255,255,255,0.10) 50%,
    rgba(255,255,255,0.05) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}

@keyframes shimmer {
  from { background-position: 200% 0; }
  to   { background-position: -200% 0; }
}

/* ────────────────────────────────────────────────────────────
   18. 空白狀態
   ──────────────────────────────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-muted);
}

.empty-state .empty-icon {
  font-size: 3rem;
  margin-bottom: 12px;
  opacity: 0.5;
}

.empty-state p {
  font-size: 0.9rem;
  line-height: 1.5;
}

/* ────────────────────────────────────────────────────────────
   19. 頁面標題
   ──────────────────────────────────────────────────────────── */
.view-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  padding-top: 8px;
  flex-wrap: wrap;
}

.back-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 1rem;
  transition: all var(--duration-fast) var(--ease-smooth);
  flex-shrink: 0;
}

.back-btn:hover { background: var(--glass-bg-hover); color: var(--text-primary); }

.view-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.view-subtitle {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 1px;
}

/* ────────────────────────────────────────────────────────────
   20. 工具提示 / 說明欄
   ──────────────────────────────────────────────────────────── */
.info-bar {
  padding: 10px 14px;
  border-radius: var(--radius-md);
  background: rgba(30,140,220,0.10);
  border: 1px solid rgba(30,140,220,0.20);
  font-size: 0.78rem;
  color: hsl(200,70%,72%);
  margin-bottom: 14px;
  display: flex;
  align-items: flex-start;
  gap: 8px;
  line-height: 1.4;
}

.info-bar .info-icon { flex-shrink: 0; }

/* ────────────────────────────────────────────────────────────
   21. 捲軸樣式
   ──────────────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 2px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.2); }

/* ────────────────────────────────────────────────────────────
   22. 響應式微調
   ──────────────────────────────────────────────────────────── */
@media (max-width: 375px) {
  .card-truku { font-size: 1.6rem; }
  .card-zh    { font-size: 1.2rem; }
  .btn        { padding: 11px 14px; font-size: 0.85rem; }
}

@media (min-width: 600px) {
  .app-wrapper { padding-top: 16px; }
  .card-viewport { height: 380px; }
}

/* ────────────────────────────────────────────────────────────
   23. 今日新字 — 批次完成畫面
   ──────────────────────────────────────────────────────────── */
.batch-complete {
  text-align: center;
  padding: 36px 20px;
}

.batch-complete .complete-icon {
  font-size: 3.2rem;
  margin-bottom: 14px;
}

.batch-complete h2 {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.batch-complete p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.batch-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 24px;
}

/* ────────────────────────────────────────────────────────────
   24. 設定列（每日新字目標調整）
   ──────────────────────────────────────────────────────────── */
.settings-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 12px 16px;
  margin-bottom: 16px;
}

.settings-row .settings-label {
  font-size: 0.82rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.settings-row .glass-select {
  flex: none;
  width: auto;
  min-width: 110px;
}

/* ────────────────────────────────────────────────────────────
   25. 辭典查詢
   ──────────────────────────────────────────────────────────── */
.dict-search-bar {
  position: relative;
  margin-bottom: 12px;
}

.dict-search-input {
  width: 100%;
  padding: 12px 14px 12px 40px;
  border-radius: var(--radius-md);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  outline: none;
  transition: border-color var(--duration-fast) var(--ease-smooth);
}

.dict-search-input::placeholder { color: var(--text-muted); }
.dict-search-input:focus { border-color: var(--amber); }

.dict-search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 0.95rem;
  pointer-events: none;
}

.dict-az-bar {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding-bottom: 4px;
  margin-bottom: 14px;
  scrollbar-width: none;
}

.dict-az-bar::-webkit-scrollbar { display: none; }

.dict-az-chip {
  flex-shrink: 0;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 700;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-secondary);
  cursor: pointer;
}

.dict-az-chip:hover,
.dict-az-chip.active {
  background: linear-gradient(135deg, var(--amber-dark), var(--amber));
  border-color: var(--amber);
  color: #fff;
}

.dict-result-meta {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 10px;
}

/* 我的最愛：詞彙／例句分開兩個區塊的小標題 */
.favorites-section-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.dict-result-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 24px;
}

.dict-result-item {
  padding: 12px 14px;
  display: flex;
  align-items: baseline;
  gap: 10px;
  cursor: pointer;
}

.dict-result-item .dict-word {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  flex-shrink: 0;
}

.dict-result-item .dict-meaning {
  font-size: 0.82rem;
  color: var(--text-secondary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.dict-detail {
  padding: 20px;
  margin-bottom: 16px;
}

.dict-detail .dict-detail-word {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.dict-detail .dict-detail-zh {
  font-size: 1.1rem;
  color: var(--amber-light);
  font-weight: 600;
  margin-bottom: 14px;
}

.dict-detail .card-sentence-box { margin-top: 0; margin-bottom: 14px; }

.dict-detail-actions {
  display: flex;
  gap: 8px;
}

/* ────────────────────────────────────────────────────────────
   26. 學習歷程時間軸
   ──────────────────────────────────────────────────────────── */
.timeline-summary {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-bottom: 16px;
}

.timeline-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 24px;
}

.timeline-day {
  padding: 14px 16px;
}

.timeline-day-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.timeline-date {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-primary);
}

.timeline-count {
  font-size: 0.72rem;
  color: var(--amber-light);
  font-weight: 600;
}

.timeline-words {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.timeline-word-chip {
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background: rgba(255,255,255,0.06);
  color: var(--text-secondary);
  border: 1px solid rgba(255,255,255,0.08);
}

/* ────────────────────────────────────────────────────────────
   27. 手繪 SVG 圖表（取代 Chart.js）
   ──────────────────────────────────────────────────────────── */
.svg-chart-wrap {
  width: 100%;
}

.svg-chart-wrap svg { display: block; width: 100%; height: auto; overflow: visible; }

.svg-chart-legend {
  display: flex;
  gap: 14px;
  justify-content: center;
  margin-top: 10px;
  flex-wrap: wrap;
}

.svg-chart-legend-item {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 0.72rem;
  color: var(--text-muted);
}

.svg-chart-legend-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* ────────────────────────────────────────────────────────────
   28. 首頁提醒橫幅 & XP／稱號卡片
   ──────────────────────────────────────────────────────────── */
.nag-banner {
  background: rgba(255, 160, 50, 0.12);
  border-color: rgba(255, 160, 50, 0.28);
  color: hsl(33, 90%, 78%);
}

.xp-card {
  padding: 16px;
  margin-bottom: 16px;
}

.xp-card-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 10px;
}

.xp-rank-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.xp-value {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.xp-value strong {
  color: var(--amber-light);
  font-size: 0.95rem;
}

.xp-next-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 6px;
  text-align: right;
}

/* ────────────────────────────────────────────────────────────
   29. 辭典子模式（查詢／情境例句／閱讀故事）
   ──────────────────────────────────────────────────────────── */
.dict-mode-chip { flex: 1; text-align: center; }

.unit-sentence-list,
.story-sentence-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-height: 60vh;
  overflow-y: auto;
  padding-right: 2px;
}

.unit-sentence-item,
.story-sentence-item {
  position: relative;
  padding: 12px 92px 12px 14px; /* 右側留空間給跟讀鈕+播放鈕+收藏鈕，避免蓋到文字 */
  background: rgba(255,255,255,0.04);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--sky);
}

/* 自然語料：正在播放的那一句字幕（跟著影片時間軸自動捲動+標示） */
.oral-line.active {
  background: var(--amber-glow);
  border-left-color: var(--amber);
}
.oral-line.active .sentence-truku { color: var(--amber-light); }

/* 字幕清單只留約3個區塊高度，避免整個頁面拉太長、把上面的影片播放器推出畫面外 */
#oralLineList {
  max-height: 380px;
}

/* 每句例句右上角的「收藏這句」按鈕（自然語料字幕／情境例句／閱讀故事共用） */
.sentence-fav-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background: transparent;
  border: none;
  font-size: 1.05rem;
  line-height: 1;
  padding: 4px;
  cursor: pointer;
}
.sentence-fav-btn:active { transform: scale(0.85); }

/* 每句例句的「播放發音」按鈕（Piper TTS 產生，辭典例句／情境例句／閱讀故事都有，
   自然對話（VOA逐字稿）沒有——影片本身已經是真人發音，不需要再疊TTS） */
.sentence-play-btn {
  position: absolute;
  top: 8px;
  right: 34px; /* 收藏鈕左邊，避免兩顆按鈕重疊 */
  background: transparent;
  border: none;
  font-size: 1.05rem;
  line-height: 1;
  padding: 4px;
  cursor: pointer;
  opacity: 0.85;
}
.sentence-play-btn:active { transform: scale(0.85); }
.sentence-play-btn.is-playing { opacity: 1; animation: pulse-play 0.8s ease-in-out infinite; }
@keyframes pulse-play { 0%,100% { opacity: 0.6; } 50% { opacity: 1; } }

/* 每句例句的「跟讀練習」按鈕（沿用字卡的 EchoController，2026-09-01延伸到句子/
   文章/自然對話。播放鈕左邊，三顆圖示：收藏(8px)/發音(34px)/跟讀(60px)） */
.sentence-echo-btn {
  position: absolute;
  top: 8px;
  right: 60px;
  background: transparent;
  border: none;
  font-size: 1.05rem;
  line-height: 1;
  padding: 4px;
  cursor: pointer;
  opacity: 0.85;
}
.sentence-echo-btn:active { transform: scale(0.85); }
.sentence-echo-btn:disabled { opacity: 0.4; cursor: default; }
.sentence-echo-btn.is-active { opacity: 1; animation: pulse-play 0.8s ease-in-out infinite; }

/* 跟讀練習進行中的行內狀態文字，預設隱藏，開始練習的那一句才會顯示 */
.sentence-echo-status {
  font-size: 0.74rem;
  color: var(--amber-light);
  margin-top: 6px;
}
.sentence-echo-status.is-ready {
  cursor: pointer;
  text-decoration: underline dotted;
  text-underline-offset: 3px;
}

/* 辭典詳細頁的例句播放鈕：位置不同（不是絕對定位疊在收藏鈕旁），用行內排版 */
.card-sentence-box { position: relative; }
#dictDetailPlayBtn {
  background: transparent;
  border: none;
  font-size: 1.1rem;
  line-height: 1;
  padding: 4px;
  cursor: pointer;
  position: absolute;
  top: 10px;
  right: 10px;
}
#dictDetailPlayBtn:active { transform: scale(0.85); }

.sentence-truku {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.6;
  margin-bottom: 4px;
}

.sentence-zh {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.sentence-vocab-row {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-top: 6px;
}

/* 句子裡可點查辭典的詞 */
.word-token {
  cursor: default;
}

.word-token.known {
  cursor: pointer;
  color: var(--amber-light);
  text-decoration: underline dotted;
  text-underline-offset: 3px;
}

.vocab-chip {
  font-size: 0.72rem;
  padding: 3px 9px;
  border-radius: var(--radius-pill);
  background: rgba(30,140,220,0.12);
  border: 1px solid rgba(30,140,220,0.25);
  color: var(--sky);
  cursor: pointer;
}

/* ────────────────────────────────────────────────────────────
   30. 相似拼寫探索
   ──────────────────────────────────────────────────────────── */
.similar-words-section {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 14px;
}

.similar-words-title {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.similar-words-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.similar-word-chip {
  font-size: 0.8rem;
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-secondary);
  cursor: pointer;
}

.similar-word-chip:hover {
  background: var(--glass-bg-hover);
  color: var(--text-primary);
  border-color: rgba(255,255,255,0.2);
}

/* ────────────────────────────────────────────────────────────
   31. 我的最愛（單詞本）
   ──────────────────────────────────────────────────────────── */
.card-fav-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 5;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  background: rgba(10, 14, 25, 0.55);
  backdrop-filter: blur(8px);
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform var(--duration-fast) var(--ease-bounce);
}

.card-fav-btn:active { transform: scale(0.85); }

#dictFavoriteBtn { font-size: 1.1rem; }

/* ────────────────────────────────────────────────────────────
   32. 每週學習小結 / 資料備份
   ──────────────────────────────────────────────────────────── */
.weekly-summary { padding: 18px; }

.weekly-summary-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.weekly-summary-item { text-align: center; }

.weekly-summary-value {
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1;
}

.weekly-summary-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.weekly-summary-delta {
  font-size: 0.72rem;
  margin-top: 4px;
  font-weight: 600;
}

.weekly-summary-delta.up   { color: var(--mint); }
.weekly-summary-delta.down { color: var(--rose); }
.weekly-summary-delta.flat { color: var(--text-muted); }

.backup-actions {
  display: flex;
  gap: 8px;
}

.backup-actions .btn { flex: 1; }

/* ────────────────────────────────────────────────────────────
   33. 選擇題測驗模式
   ──────────────────────────────────────────────────────────── */
.quiz-question-card {
  padding: 32px 22px;
  text-align: center;
  margin-bottom: 16px;
}

.quiz-question-word {
  font-size: clamp(1.8rem, 8vw, 2.4rem);
  font-weight: 800;
  color: var(--text-primary);
}

/* 例句填空題：句子比單詞長很多，字級縮小、粗細降低才不會爆版 */
.quiz-question-word.quiz-question-word--sentence {
  font-size: clamp(1.1rem, 5vw, 1.4rem);
  font-weight: 600;
  line-height: 1.5;
}

.quiz-question-hint {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 10px;
}

.quiz-question-blank {
  color: var(--amber);
  font-weight: 800;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 16px;
}

.quiz-option-btn {
  width: 100%;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  text-align: left;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-smooth);
}

.quiz-option-btn:hover:not(:disabled) { background: var(--glass-bg-hover); }
.quiz-option-btn:disabled { cursor: default; }

.quiz-option-btn.correct {
  background: rgba(50,200,130,0.18);
  border-color: rgba(50,200,130,0.5);
  color: hsl(160,75%,80%);
}

.quiz-option-btn.wrong {
  background: rgba(220,50,70,0.18);
  border-color: rgba(220,50,70,0.5);
  color: hsl(355,90%,82%);
}

.quiz-result-screen {
  text-align: center;
  padding: 36px 20px;
}

.quiz-result-score {
  font-size: 2.4rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--amber-light), var(--amber));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin: 10px 0;
}