/* ============================================
   单词挑战 - 横屏手机游戏样式
   ============================================ */

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

/* 全局变量 */
:root {
  --primary: #4A90D9;
  --primary-dark: #357ABD;
  --success: #27AE60;
  --success-dark: #1E8449;
  --danger: #E74C3C;
  --danger-dark: #C0392B;
  --warning: #F39C12;
  --bg-dark: #1a1a2e;
  --bg-medium: #16213e;
  --bg-light: #0f3460;
  --text-primary: #ffffff;
  --text-secondary: #b8c5d6;
  --card-bg: rgba(255, 255, 255, 0.08);
  --card-border: rgba(255, 255, 255, 0.12);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  --radius: 12px;
  --radius-lg: 16px;
}

/* HTML/Body 全屏横屏 */
html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  background: linear-gradient(135deg, var(--bg-dark) 0%, var(--bg-medium) 50%, var(--bg-light) 100%);
  color: var(--text-primary);
  touch-action: manipulation;
  -webkit-user-select: none;
  user-select: none;
}

/* 应用容器 */
#app {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ============================================
   页面切换动画
   ============================================ */
.page {
  display: none;
  width: 100%;
  height: 100%;
  flex-direction: column;
  overflow: hidden;
  animation: fadeIn 0.3s ease;
}

.page.active {
  display: flex;
}

@keyframes fadeIn {
  from { opacity: 0; transform: scale(0.98); }
  to { opacity: 1; transform: scale(1); }
}

@keyframes slideUp {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-10px); }
  75% { transform: translateX(10px); }
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes ripple {
  0% { transform: scale(0.8); opacity: 1; }
  100% { transform: scale(2.5); opacity: 0; }
}

@keyframes countdown-pop {
  0% { transform: scale(0.5); opacity: 0; }
  50% { transform: scale(1.3); opacity: 1; }
  100% { transform: scale(1); opacity: 1; }
}

/* ============================================
   设置页面
   ============================================ */
.settings-page {
  padding: 20px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.settings-title {
  font-size: 28px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--primary), #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* 词库选择菜单 */
.menu-section {
  margin-bottom: 16px;
}

.menu-section-title {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 8px;
  padding-left: 4px;
}

/* 一级菜单 - 类别 */
.category-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  margin-bottom: 12px;
}

.category-btn {
  padding: 12px 16px;
  background: var(--card-bg);
  border: 2px solid var(--card-border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: left;
}

.category-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  box-shadow: 0 4px 15px rgba(74, 144, 217, 0.4);
}

.category-btn:active {
  transform: scale(0.97);
}

/* 二级菜单 - 词性 */
.pos-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-bottom: 12px;
}

.pos-btn {
  padding: 10px 12px;
  background: var(--card-bg);
  border: 2px solid var(--card-border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: center;
}

.pos-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  box-shadow: 0 4px 15px rgba(74, 144, 217, 0.4);
}

.pos-btn:active {
  transform: scale(0.97);
}

/* 三级菜单 - 级别 */
.level-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-bottom: 16px;
}

.level-btn {
  padding: 10px 12px;
  background: var(--card-bg);
  border: 2px solid var(--card-border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: center;
}

.level-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  box-shadow: 0 4px 15px rgba(74, 144, 217, 0.4);
}

.level-btn:active {
  transform: scale(0.97);
}

/* 设置项 */
.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--card-bg);
  border-radius: var(--radius);
  margin-bottom: 8px;
}

.setting-label {
  font-size: 15px;
  font-weight: 500;
}

.setting-options {
  display: flex;
  gap: 8px;
}

.time-btn, .count-btn {
  padding: 8px 16px;
  background: var(--card-bg);
  border: 2px solid var(--card-border);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.time-btn.active, .count-btn.active {
  background: var(--primary);
  border-color: var(--primary);
}

.time-btn:active, .count-btn:active {
  transform: scale(0.95);
}

/* 勾选项 */
.checkbox-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--card-bg);
  border-radius: var(--radius);
  margin-bottom: 8px;
  cursor: pointer;
}

.checkbox {
  width: 22px;
  height: 22px;
  border: 2px solid var(--card-border);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  flex-shrink: 0;
}

.checkbox.checked {
  background: var(--primary);
  border-color: var(--primary);
}

.checkbox.checked::after {
  content: '✓';
  color: white;
  font-size: 14px;
  font-weight: bold;
}

.checkbox-label {
  font-size: 15px;
}

/* 词数统计 */
.word-count-display {
  text-align: center;
  padding: 10px;
  background: var(--card-bg);
  border-radius: var(--radius);
  margin-bottom: 12px;
  font-size: 14px;
  color: var(--text-secondary);
}

.word-count-display strong {
  color: var(--primary);
  font-size: 18px;
}

/* 开始按钮 */
.start-btn {
  width: 100%;
  padding: 16px;
  background: linear-gradient(135deg, var(--success), var(--success-dark));
  border: none;
  border-radius: var(--radius-lg);
  color: white;
  font-size: 20px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 4px 15px rgba(39, 174, 96, 0.4);
  margin-top: 8px;
}

.start-btn:active {
  transform: scale(0.97);
  box-shadow: 0 2px 8px rgba(39, 174, 96, 0.3);
}

.start-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ============================================
   倒计时页面
   ============================================ */
.countdown-page {
  display: flex;
  flex-direction: column;
  flex: 1;
  width: 100%;
  justify-content: center;
  align-items: center;
}

.countdown-number {
  font-size: 120px;
  font-weight: 900;
  background: linear-gradient(135deg, var(--primary), #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: countdown-pop 0.5s ease;
}

.countdown-text {
  font-size: 24px;
  color: var(--text-secondary);
  margin-top: 10px;
}

/* ============================================
   游戏页面
   ============================================ */
.game-page {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

/* 顶部信息栏 */
.game-header {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 20px;
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(10px);
  z-index: 10;
}

.game-timer {
  font-size: 28px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  min-width: 80px;
  text-align: center;
  background: rgba(0, 0, 0, 0.4);
  padding: 4px 12px;
  border-radius: 8px;
}

.game-timer.warning {
  color: var(--warning);
  animation: pulse 1s ease infinite;
}

.game-timer.danger {
  color: var(--danger);
  animation: pulse 0.5s ease infinite;
}

.game-score {
  font-size: 18px;
  font-weight: 600;
}

.game-progress {
  font-size: 14px;
  color: var(--text-secondary);
}

/* 30秒提示 */
.time-warning {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 36px;
  font-weight: 700;
  color: var(--warning);
  text-shadow: 0 0 20px rgba(243, 156, 18, 0.5);
  animation: bounce 0.5s ease;
  pointer-events: none;
  z-index: 20;
}

/* 卡片容器 */
.card-container {
  position: absolute;
  top: 60px;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  perspective: 1000px;
}

/* 单词卡片 */
.word-card {
  width: 85%;
  max-width: 500px;
  height: 65%;
  background: linear-gradient(145deg, rgba(255,255,255,0.12), rgba(255,255,255,0.05));
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 30px;
  box-shadow: var(--shadow);
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.4s ease;
  cursor: grab;
  touch-action: none;
  will-change: transform, opacity;
}

.word-card.swiping-correct {
  transform: translateY(100vh) rotate(20deg) scale(0.8) !important;
  opacity: 0 !important;
}

.word-card.swiping-wrong {
  transform: translateY(-100vh) rotate(-20deg) scale(0.8) !important;
  opacity: 0 !important;
}

.word-card.entering {
  animation: cardEnter 0.35s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes cardEnter {
  from {
    transform: translateY(30px) scale(0.95);
    opacity: 0;
  }
  to {
    transform: translateY(0) scale(1);
    opacity: 1;
  }
}

.word-en {
  font-size: 48px;
  font-weight: 800;
  margin-bottom: 10px;
  text-align: center;
  line-height: 1.2;
}

.word-ipa {
  font-size: 22px;
  color: var(--text-secondary);
  margin-bottom: 20px;
  font-style: italic;
}

.word-pos {
  font-size: 16px;
  color: var(--primary);
  background: rgba(74, 144, 217, 0.15);
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 15px;
  font-weight: 500;
}

/* 中文 + 拼音面 */
.word-cn-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.word-cn {
  font-size: 52px;
  font-weight: 800;
  text-align: center;
  line-height: 1.3;
  letter-spacing: 4px;
}

.word-py {
  font-size: 24px;
  color: var(--text-secondary);
  text-align: center;
  letter-spacing: 2px;
}

/* 英文面（答对/答错后短暂显示） */
.word-en-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.word-cn-placeholder {
  font-size: 20px;
  color: var(--text-secondary);
  opacity: 0.6;
}

/* 滑动提示 */
.swipe-hint {
  position: absolute;
  bottom: 20px;
  left: 0;
  right: 0;
  text-align: center;
  font-size: 13px;
  color: var(--text-secondary);
  opacity: 0.6;
}

.hint-correct {
  color: var(--success);
  position: absolute;
  bottom: 60px;
  left: 30px;
  font-size: 16px;
  font-weight: 600;
  opacity: 0;
  transition: opacity 0.2s;
}

.hint-wrong {
  color: var(--danger);
  position: absolute;
  bottom: 60px;
  right: 30px;
  font-size: 16px;
  font-weight: 600;
  opacity: 0;
  transition: opacity 0.2s;
}

/* 暂停/退出覆盖层 */
.overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.85);
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 100;
  gap: 16px;
}

.overlay.active {
  display: flex;
}

.overlay-title {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 20px;
}

.overlay-btn {
  width: 200px;
  padding: 14px;
  border: none;
  border-radius: var(--radius);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.overlay-btn:active {
  transform: scale(0.95);
}

.overlay-btn.resume {
  background: var(--success);
  color: white;
}

.overlay-btn.restart {
  background: var(--warning);
  color: white;
}

.overlay-btn.quit {
  background: var(--danger);
  color: white;
}

/* ============================================
   结算页面
   ============================================ */
.result-page {
  display: flex;
  flex-direction: column;
  flex: 1;
  width: 100%;
  justify-content: center;
  align-items: center;
  padding: 30px;
  overflow-y: auto;
}

.result-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 30px 40px;
  text-align: center;
  max-width: 450px;
  width: 100%;
  box-shadow: var(--shadow);
}

.result-title {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 24px;
  background: linear-gradient(135deg, var(--primary), #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.result-stats {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px;
  margin-bottom: 24px;
}

.stat-item {
  text-align: center;
}

.stat-value {
  font-size: 36px;
  font-weight: 800;
  line-height: 1;
  margin-bottom: 4px;
}

.stat-value.correct {
  color: var(--success);
}

.stat-value.wrong {
  color: var(--danger);
}

.stat-value.total {
  color: var(--primary);
}

.stat-label {
  font-size: 13px;
  color: var(--text-secondary);
}

.result-message {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 24px;
  line-height: 1.5;
}

.result-buttons {
  display: flex;
  gap: 12px;
  justify-content: center;
}

.result-btn {
  padding: 12px 24px;
  border: none;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  min-width: 120px;
}

.result-btn:active {
  transform: scale(0.95);
}

.result-btn.restart {
  background: var(--success);
  color: white;
}

.result-btn.reselect {
  background: var(--primary);
  color: white;
}

/* 答案详情列表 */
.result-word-list {
  max-height: 200px;
  overflow-y: auto;
  margin-top: 16px;
  text-align: left;
  padding: 8px;
  background: rgba(0,0,0,0.2);
  border-radius: 8px;
}

.result-word-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  border-bottom: 1px solid rgba(255,255,255,0.05);
  font-size: 13px;
}

.result-word-item:last-child {
  border-bottom: none;
}

.result-word-icon {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  flex-shrink: 0;
}

.result-word-icon.correct {
  background: rgba(39, 174, 96, 0.2);
  color: var(--success);
}

.result-word-icon.wrong {
  background: rgba(231, 76, 60, 0.2);
  color: var(--danger);
}

.result-word-en {
  font-weight: 600;
  min-width: 80px;
}

.result-word-cn {
  color: var(--text-secondary);
}

/* ============================================
   响应式适配
   ============================================ */
@media (max-height: 500px) {
  .word-en {
    font-size: 36px;
  }
  .word-ipa {
    font-size: 18px;
  }
  .word-card {
    height: 75%;
    padding: 20px;
  }
  .settings-title {
    font-size: 22px;
    margin-bottom: 12px;
  }
}

@media (min-width: 768px) {
  .word-card {
    max-width: 600px;
  }
  .word-en {
    font-size: 56px;
  }
}

/* 滚动条隐藏 */
::-webkit-scrollbar {
  width: 4px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.2);
  border-radius: 2px;
}

/* 全屏API适配 */
:fullscreen {
  width: 100vw;
  height: 100vh;
}

:-webkit-full-screen {
  width: 100vw;
  height: 100vh;
}