/* ==========================================
   1. CSS Reset & 基礎變數系統
   ========================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  /* 色彩系統 (符合 WCAG AA+ 對比度) */
  --primary: #ff4757;
  --primary-hover: #ff6b81;
  --primary-text: #ffffff;
  --bg-color: #0f172a;
  --card-bg: #1e293b;
  --text-main: #f8fafc;
  --text-secondary: #cbd5e1;  /* 提高亮度，對比度提升至 8:1 */
  --accent-yellow: #fbbf24;
  --accent-blue: #60a5fa;
  --border-subtle: rgba(255, 255, 255, 0.12);
  --shadow-card: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
  
  /* 間距與圓角 */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  
  /* 字體 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

/* 2. 全域樣式 */
body {
  font-family: var(--font-sans);
  background-color: var(--bg-color);
  color: var(--text-main);
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: var(--spacing-md);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* 螢幕閱讀器專用隱藏類別 (A11y Screen Reader Only) */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* 3. 主容器 (響應式) */
.container {
  width: 100%;
  max-width: 420px;
  background: var(--card-bg);
  padding: var(--spacing-lg) var(--spacing-md);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  border: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  align-items: center;
  transition: padding 0.2s ease;
}

/* 4. 標頭與語言切換 */
.header {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-sm);
}

.header h1 {
  font-size: 1.25rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), #ffa502);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.lang-switch {
  display: flex;
  gap: var(--spacing-xs);
}

.lang-switch button {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 20px;
  cursor: pointer;
  font-size: 0.75rem;
  font-weight: 600;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}

.lang-switch button:hover {
  background: rgba(255, 255, 255, 0.12);
  color: var(--text-main);
}
.lang-switch button:focus-visible {
  outline: 2px solid var(--accent-blue);
  outline-offset: 2px;
}
.lang-switch button.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* 5. 模式切換標籤 */
.mode-tabs {
  display: flex;
  width: 100%;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.tab-btn {
  flex: 1;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: var(--spacing-sm) var(--spacing-xs);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s, box-shadow 0.2s;
}

.tab-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-main);
}
.tab-btn:focus-visible {
  outline: 2px solid var(--accent-blue);
  outline-offset: 2px;
}
.tab-btn.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  box-shadow: 0 4px 12px rgba(255, 71, 87, 0.35);
}

/* 6. 隱私與通知欄 */
.privacy-bar {
  width: 100%;
  background: rgba(255, 255, 255, 0.04);
  border-left: 3px solid var(--accent-blue);
  color: var(--text-secondary);
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: 0.72rem;
  border-radius: var(--radius-sm);
  margin-bottom: var(--spacing-sm);
  line-height: 1.4;
}

.notice-bar {
  width: 100%;
  background: rgba(96, 165, 250, 0.08);
  border: 1px solid var(--accent-blue);
  color: var(--accent-blue);
  padding: var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  text-align: center;
  margin-bottom: var(--spacing-md);
}

/* 7. 輪盤容器 (響應式尺寸) */
.wheel-container {
  position: relative;
  width: min(300px, 80vw, 100%);
  aspect-ratio: 1 / 1;
  margin-bottom: var(--spacing-md);
  display: flex;
  justify-content: center;
  align-items: center;
}

#wheelCanvas {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  display: block;
  background: transparent;
}

/* 指針 */
.wheel-container::before {
  content: '';
  position: absolute;
  top: -6px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 0;
  border-left: 10px solid transparent;
  border-right: 10px solid transparent;
  border-top: 18px solid var(--primary);
  z-index: 10;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.5));
}

/* 8. 主要按鈕 */
.spin-btn {
  width: 100%;
  background: linear-gradient(135deg, var(--primary), var(--primary-hover));
  color: #fff;
  border: none;
  padding: 14px;
  font-size: 1.1rem;
  font-weight: 700;
  border-radius: var(--radius-md);
  cursor: pointer;
  box-shadow: 0 6px 15px rgba(255, 71, 87, 0.35);
  transition: transform 0.15s, box-shadow 0.15s, opacity 0.2s;
}

.spin-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(255, 71, 87, 0.45);
}
.spin-btn:active {
  transform: scale(0.97);
}
.spin-btn:focus-visible {
  outline: 2px solid var(--accent-blue);
  outline-offset: 3px;
}
.spin-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

/* 9. 投票區塊 */
.vote-section {
  width: 100%;
  margin-top: var(--spacing-md);
  text-align: left;
}

.vote-section h3 {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
}

.input-group {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.input-group input {
  flex: 1;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: #fff;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.input-group input:focus {
  outline: none;
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.25);
}
.input-group input::placeholder {
  color: var(--text-secondary);
  opacity: 0.6;
}

.action-btn, .geo-btn {
  background: var(--accent-blue);
  color: #fff;
  border: none;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 600;
  transition: background 0.2s, transform 0.1s;
  white-space: nowrap;
}
.action-btn:hover, .geo-btn:hover {
  background: #3b82f6;
}
.action-btn:active, .geo-btn:active {
  transform: scale(0.97);
}
.action-btn:focus-visible, .geo-btn:focus-visible {
  outline: 2px solid var(--accent-blue);
  outline-offset: 2px;
}

/* 10. 選項清單 */
.item-list {
  list-style: none;
  width: 100%;
}

.item-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(255, 255, 255, 0.03);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-sm);
  margin-bottom: var(--spacing-xs);
  font-size: 0.85rem;
  gap: var(--spacing-sm);
}

.restaurant-name {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
}

.vote-controls {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  flex-shrink: 0;
}

.vote-btn {
  background: rgba(255, 255, 255, 0.1);
  border: none;
  color: #fff;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  cursor: pointer;
  font-weight: bold;
  transition: background 0.2s, transform 0.1s;
  display: flex;
  align-items: center;
  justify-content: center;
}
.vote-btn:hover {
  background: rgba(255, 255, 255, 0.2);
}
.vote-btn:active {
  transform: scale(0.92);
}
.vote-btn:focus-visible {
  outline: 2px solid var(--accent-blue);
  outline-offset: 2px;
}

/* 11. 結果顯示 (具備彈出動畫) */
.result-box {
  width: 100%;
  margin-top: var(--spacing-md);
  padding: var(--spacing-sm);
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent-yellow);
  text-align: center;
  min-height: 60px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  animation: popIn 0.35s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

@keyframes popIn {
  0% {
    opacity: 0;
    transform: scale(0.9) translateY(8px);
  }
  100% {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.nav-btn {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  background: rgba(96, 165, 250, 0.15);
  border: 1px solid var(--accent-blue);
  color: var(--accent-blue);
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-size: 0.8rem;
  font-weight: 600;
  transition: background 0.2s, color 0.2s;
}
.nav-btn:hover {
  background: var(--accent-blue);
  color: #fff;
}
.nav-btn:focus-visible {
  outline: 2px solid var(--accent-blue);
  outline-offset: 2px;
}

/* ==========================================
   12. 響應式設計 (Mobile First)
   ========================================== */
@media (max-width: 420px) {
  .container {
    padding: var(--spacing-md) var(--spacing-sm);
  }
  .header h1 {
    font-size: 1.1rem;
  }
  .tab-btn {
    font-size: 0.7rem;
    padding: 6px 4px;
  }
  .wheel-container {
    width: min(260px, 80vw);
  }
  .spin-btn {
    font-size: 1rem;
    padding: 12px;
  }
  .input-group input {
    font-size: 0.8rem;
    padding: 6px 10px;
  }
  .action-btn, .geo-btn {
    font-size: 0.7rem;
    padding: 6px 10px;
  }
  .item-row {
    font-size: 0.8rem;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
  }
  .vote-btn {
    width: 24px;
    height: 24px;
  }
}

/* ==========================================
   13. 打印樣式 (Print Friendly)
   ========================================== */
@media print {
  body {
    background: #fff;
    color: #000;
  }
  .container {
    box-shadow: none;
    border: 1px solid #ccc;
    background: #fff;
  }
  .lang-switch, .mode-tabs, .spin-btn, .input-group, .vote-controls, .nav-btn, .notice-bar, .privacy-bar {
    display: none !important;
  }
  .result-box {
    border: 1px solid #000;
    background: #f9f9f9;
    color: #000;
  }
  #wheelCanvas {
    border: 1px solid #ccc;
  }
}