/* ============================================
   国家安全教育日答题 - Apple 高级质感设计
   亮色主题 · Pinkish 光晕
   ============================================ */

:root {
  /* Apple 标准色 */
  --apple-blue: #007AFF;
  --apple-green: #34C759;
  --apple-red: #FF3B30;
  --apple-orange: #FF9500;
  --apple-yellow: #FFCC00;
  --apple-pink: #FF2D55;
  --apple-purple: #AF52DE;
  
  /* 亮色背景系统 */
  --bg-primary: #F2F2F7;
  --bg-secondary: #FFFFFF;
  --bg-tertiary: #E5E5EA;
  
  /* 玻璃材质 - 亮色 */
  --glass-thin: rgba(255, 255, 255, 0.65);
  --glass-medium: rgba(255, 255, 255, 0.85);
  --glass-thick: rgba(255, 255, 255, 0.95);
  --glass-border: rgba(0, 0, 0, 0.08);
  --glass-border-subtle: rgba(0, 0, 0, 0.04);
  
  /* 文字层级 - 亮色 */
  --text-primary: rgba(0, 0, 0, 1);
  --text-secondary: rgba(0, 0, 0, 0.6);
  --text-tertiary: rgba(0, 0, 0, 0.35);
  
  /* 连续曲率圆角 */
  --radius-sm: 14px;
  --radius-md: 20px;
  --radius-lg: 28px;
  --radius-xl: 36px;
  
  /* Apple 式动效曲线 */
  --ease-spring: cubic-bezier(0.175, 0.885, 0.32, 1.275);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out: cubic-bezier(0.33, 1, 0.68, 1);
  
  /* 光影 - 亮色 */
  --shadow-subtle: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-medium: 0 8px 24px rgba(0, 0, 0, 0.1);
  --shadow-deep: 0 16px 48px rgba(0, 0, 0, 0.15);
  --glow-blue: 0 0 24px rgba(0, 122, 255, 0.25);
  --glow-green: 0 0 20px rgba(52, 199, 89, 0.3);
  --glow-pink: 0 0 30px rgba(255, 45, 85, 0.2);
}

/* ============================================
   基础重置
   ============================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'PingFang SC', 'Helvetica Neue', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

#app {
  height: 100%;
  position: relative;
  overflow: hidden;
}

/* ============================================
   背景 - Pinkish 光晕
   ============================================ */
.screen-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    radial-gradient(ellipse at 20% 10%, rgba(255, 45, 85, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 30%, rgba(175, 82, 222, 0.06) 0%, transparent 45%),
    radial-gradient(ellipse at 50% 80%, rgba(0, 122, 255, 0.05) 0%, transparent 50%),
    var(--bg-primary);
}

.screen-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='400' height='400' filter='url(%23noise)' opacity='0.025'/%3E%3C/svg%3E");
  opacity: 1;
  pointer-events: none;
}

.screen {
  position: absolute;
  inset: 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.35s var(--ease-smooth), visibility 0.35s;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.screen.active {
  opacity: 1;
  visibility: visible;
}

.screen-content {
  position: relative;
  z-index: 1;
  min-height: 100%;
  display: flex;
  flex-direction: column;
  padding: 20px;
  padding-bottom: calc(20px + env(safe-area-inset-bottom));
}

/* ============================================
   首页
   ============================================ */
#home-screen .screen-content {
  align-items: center;
  justify-content: center;
  gap: 32px;
}

.poster-container {
  width: 100%;
  max-width: 280px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-deep);
  transform: translateZ(0);
}

.poster {
  width: 100%;
  height: auto;
  display: block;
}

.title {
  font-size: 34px;
  font-weight: 700;
  letter-spacing: -0.5px;
  text-align: center;
  background: linear-gradient(180deg, var(--text-primary) 0%, rgba(0,0,0,0.75) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  font-size: 16px;
  color: var(--text-secondary);
  font-weight: 400;
  letter-spacing: 0.3px;
}

/* ============================================
   按钮
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 16px 32px;
  font-size: 17px;
  font-weight: 600;
  font-family: inherit;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s var(--ease-out);
  -webkit-appearance: none;
  appearance: none;
  position: relative;
  overflow: hidden;
}

.btn:active {
  transform: scale(0.96);
}

.btn-primary {
  background: var(--apple-blue);
  color: white !important;
  box-shadow: 0 4px 16px rgba(0, 122, 255, 0.25);
}

.btn-primary:hover {
  background: #006EE6;
  box-shadow: 0 6px 20px rgba(0, 122, 255, 0.35);
}

.btn-secondary {
  background: var(--glass-thin);
  color: var(--text-primary);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 0.5px solid var(--glass-border);
}

.btn-secondary:hover {
  background: var(--glass-medium);
}

.btn-text {
  background: transparent;
  color: var(--apple-blue);
  padding: 12px 20px;
  font-size: 16px;
}

.btn-large {
  width: 100%;
  max-width: 300px;
  padding: 18px 40px;
  font-size: 18px;
  letter-spacing: -0.3px;
}

.btn-icon {
  width: 18px;
  height: 18px;
  stroke-width: 2.5;
}

.btn-icon-only {
  padding: 10px;
}

.hidden {
  display: none !important;
}

/* ============================================
   卡片
   ============================================ */
.card {
  background: var(--glass-medium);
  backdrop-filter: blur(30px) saturate(180%);
  -webkit-backdrop-filter: blur(30px) saturate(180%);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  width: 100%;
  max-width: 380px;
  border: 0.5px solid var(--glass-border);
  box-shadow: var(--shadow-medium);
}

.card h2 {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.5px;
  text-align: center;
  margin-bottom: 6px;
}

.card .hint {
  font-size: 14px;
  color: var(--text-tertiary);
  text-align: center;
  margin-bottom: 28px;
  font-weight: 400;
}

/* ============================================
   输入框
   ============================================ */
.input-group {
  margin-bottom: 12px;
}

.input-field {
  width: 100%;
  padding: 18px 20px;
  font-size: 17px;
  font-family: inherit;
  color: var(--text-primary);
  background: var(--glass-thin);
  border: 0.5px solid var(--glass-border);
  border-radius: var(--radius-md);
  outline: none;
  transition: all 0.2s var(--ease-out);
}

.input-field::placeholder {
  color: var(--text-tertiary);
}

.input-field:focus {
  background: var(--glass-medium);
  border-color: var(--apple-blue);
  box-shadow: 0 0 0 4px rgba(0, 122, 255, 0.12);
}

.error-msg {
  font-size: 14px;
  color: var(--apple-red);
  text-align: center;
  min-height: 20px;
  margin-bottom: 20px;
  font-weight: 500;
}

.btn-group {
  display: flex;
  gap: 12px;
}

.btn-group .btn {
  flex: 1;
}

.btn-group-vertical {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
  max-width: 300px;
}

/* ============================================
   答题页
   ============================================ */
#quiz-screen .screen-content {
  padding: 12px;
  padding-top: calc(100px + env(safe-area-inset-top));
  padding-bottom: 100px;
}

.quiz-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  padding: 16px 20px;
  padding-top: calc(16px + env(safe-area-inset-top));
  background: transparent;
  z-index: 100;
}

/* 进度条包装器 */
.progress-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.progress-text {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.3px;
}

.progress-bar {
  width: 100%;
  max-width: 400px;
  height: 8px;
  background: rgba(0, 0, 0, 0.15);
  border-radius: 4px;
  overflow: hidden;
  position: relative;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.15);
}

.progress-fill {
  height: 100%;
  background: transparent;
  border-radius: 4px;
  width: 100%;
  transition: width 0.5s var(--ease-spring);
}

/* 进度分段 */
.progress-segments {
  position: absolute;
  inset: 0;
  display: flex;
  gap: 4px;
  padding: 2px;
}

.progress-segment {
  flex: 1;
  height: 100%;
  background: rgba(255, 255, 255, 0.5);
  border-radius: 2px;
  transition: all 0.3s var(--ease-out);
}

.progress-segment.pending {
  background: rgba(255, 255, 255, 0.4);
}

.progress-segment.correct {
  background: var(--apple-green);
  box-shadow: 0 0 8px rgba(52, 199, 89, 0.5);
}

.progress-segment.wrong {
  background: var(--apple-red);
  box-shadow: 0 0 8px rgba(255, 59, 48, 0.5);
}

/* Combo */
.combo-container {
  position: fixed;
  top: calc(120px + env(safe-area-inset-top));
  right: 20px;
  text-align: center;
  z-index: 90;
  opacity: 0;
  transform: scale(0.9) translateY(10px);
  transition: all 0.3s var(--ease-spring);
  pointer-events: none;
}

.combo-container.active {
  opacity: 1;
  transform: scale(1) translateY(0);
}

.combo-count {
  font-size: 42px;
  font-weight: 800;
  background: linear-gradient(180deg, var(--apple-orange) 0%, var(--apple-red) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  letter-spacing: -1px;
  filter: drop-shadow(0 2px 8px rgba(255, 149, 0, 0.3));
}

.combo-label {
  font-size: 12px;
  color: var(--text-tertiary);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Combo Popup */
.combo-popup {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  z-index: 200;
  text-align: center;
  pointer-events: none;
  opacity: 0;
}

.combo-popup.show {
  animation: comboBurst 0.5s var(--ease-spring) forwards;
}

@keyframes comboBurst {
  0% {
    transform: translate(-50%, -50%) scale(0.8);
    opacity: 0;
  }
  30% {
    opacity: 1;
  }
  100% {
    transform: translate(-50%, -50%) scale(1.1);
    opacity: 0;
  }
}

.combo-number {
  font-size: 72px;
  font-weight: 900;
  background: linear-gradient(180deg, var(--apple-yellow) 0%, var(--apple-orange) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  letter-spacing: -2px;
  filter: drop-shadow(0 4px 16px rgba(255, 204, 0, 0.4));
}

.combo-text {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-top: 4px;
}

/* Question Wrapper */
.question-wrapper {
  position: relative;
  margin-bottom: 20px;
}

/* Question Card */
.question-card {
  background: var(--glass-medium);
  backdrop-filter: blur(30px) saturate(180%);
  -webkit-backdrop-filter: blur(30px) saturate(180%);
  border-radius: var(--radius-lg);
  padding: 24px 28px 28px 28px;
  border: 0.5px solid var(--glass-border);
  position: relative;
  box-shadow: var(--shadow-subtle);
}

.difficulty-badge {
  position: absolute;
  top: -12px;
  left: 24px;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 700;
  background: var(--bg-primary);
  border: 0.5px solid var(--glass-border);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
  z-index: 10;
}

.difficulty-badge.easy {
  color: white;
  background: var(--apple-green);
  border-color: var(--apple-green);
}

.difficulty-badge.medium {
  color: white;
  background: var(--apple-orange);
  border-color: var(--apple-orange);
}

.difficulty-badge.hard {
  color: white;
  background: var(--apple-red);
  border-color: var(--apple-red);
}

.question-text {
  font-size: 19px;
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: -0.3px;
  color: var(--text-primary);
}

/* Options */
.options-container {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
}

.option-btn {
  background: var(--glass-thin);
  border: 0.5px solid var(--glass-border-subtle);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  font-size: 16px;
  color: var(--text-secondary);
  font-family: inherit;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
  transition: all 0.15s var(--ease-out);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.option-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--apple-blue);
  opacity: 0;
  transition: opacity 0.15s var(--ease-out);
}

.option-btn:hover {
  background: var(--glass-medium);
  border-color: var(--glass-border);
}

.option-btn:active {
  transform: scale(0.985);
}

.option-btn.selected {
  background: rgba(0, 122, 255, 0.12);
  border-color: var(--apple-blue);
  color: var(--text-primary);
}

.option-btn.selected::before {
  opacity: 0.06;
}

.option-btn.correct {
  background: rgba(52, 199, 89, 0.12);
  border-color: var(--apple-green);
  color: var(--text-primary);
  box-shadow: 0 0 0 2px rgba(52, 199, 89, 0.08), var(--shadow-subtle);
}

.option-btn.correct::before {
  opacity: 0.04;
}

.option-btn.wrong {
  background: rgba(255, 59, 48, 0.12);
  border-color: var(--apple-red);
  color: var(--text-primary);
  box-shadow: 0 0 0 2px rgba(255, 59, 48, 0.08), var(--shadow-subtle);
}

.option-btn.wrong::before {
  opacity: 0.04;
}

.option-btn.disabled {
  pointer-events: none;
  opacity: 0.5;
}

/* Feedback */
.feedback-container {
  background: var(--glass-thin);
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
  border-radius: var(--radius-md);
  padding: 20px;
  border: 0.5px solid var(--glass-border-subtle);
  opacity: 0;
  transform: translateY(12px);
  transition: all 0.3s var(--ease-out);
}

.feedback-container.show {
  opacity: 1;
  transform: translateY(0);
}

.feedback-icon {
  font-size: 28px;
  margin-bottom: 8px;
}

.feedback-text {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 6px;
  letter-spacing: -0.3px;
}

.feedback-text.correct {
  color: var(--apple-green);
}

.feedback-text.wrong {
  color: var(--apple-red);
}

.feedback-explanation {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  padding-top: 14px;
  border-top: 0.5px solid var(--glass-border-subtle);
  font-weight: 400;
}

/* Footer */
.quiz-footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 16px 20px;
  padding-bottom: calc(16px + env(safe-area-inset-bottom));
  background: linear-gradient(180deg, transparent 0%, rgba(242,242,247,0.95) 100%);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  display: flex;
  justify-content: center;
  z-index: 100;
  border-top: 0.5px solid var(--glass-border-subtle);
}

.quiz-footer .btn {
  max-width: 100%;
}

.quiz-footer .btn-primary .btn-text {
  color: white !important;
}

/* ============================================
   结算页
   ============================================ */
#result-screen .screen-content {
  align-items: center;
  justify-content: center;
}

.result-card {
  background: var(--glass-medium);
  backdrop-filter: blur(30px) saturate(180%);
  -webkit-backdrop-filter: blur(30px) saturate(180%);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  width: 100%;
  max-width: 380px;
  text-align: center;
  border: 0.5px solid var(--glass-border);
  box-shadow: var(--shadow-medium);
  animation: resultFadeIn 0.5s var(--ease-out);
}

@keyframes resultFadeIn {
  from {
    opacity: 0;
    transform: translateY(24px) scale(0.96);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.result-icon {
  font-size: 56px;
  margin-bottom: 12px;
  animation: iconBounce 0.6s var(--ease-spring);
}

@keyframes iconBounce {
  0% { transform: scale(0); }
  60% { transform: scale(1.1); }
  100% { transform: scale(1); }
}

.result-title {
  font-size: 26px;
  font-weight: 700;
  margin-bottom: 32px;
  letter-spacing: -0.5px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}

.stat-item {
  background: var(--glass-thin);
  border: 0.5px solid var(--glass-border-subtle);
  border-radius: var(--radius-md);
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.stat-value {
  font-size: 28px;
  font-weight: 700;
  background: linear-gradient(180deg, var(--text-primary) 0%, rgba(0,0,0,0.6) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.5px;
}

.stat-label {
  font-size: 12px;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  font-weight: 500;
}

/* 用户排名显示 */
.user-rank-container {
  margin-bottom: 20px;
}

.rank-display {
  background: linear-gradient(135deg, rgba(0, 122, 255, 0.1) 0%, rgba(0, 122, 255, 0.05) 100%);
  border: 1px solid var(--apple-blue);
  border-radius: var(--radius-md);
  padding: 20px;
  text-align: center;
}

.rank-label {
  display: block;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
}

.rank-value {
  display: block;
  font-size: 32px;
  font-weight: 800;
  color: var(--apple-blue);
  letter-spacing: -0.5px;
}

.result-details {
  background: var(--glass-thin);
  border: 0.5px solid var(--glass-border-subtle);
  border-radius: var(--radius-md);
  padding: 16px;
  margin-bottom: 24px;
  text-align: left;
  max-height: 180px;
  overflow-y: auto;
}

.result-details h4 {
  font-size: 12px;
  color: var(--text-tertiary);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  font-weight: 600;
}

.result-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
  border-bottom: 0.5px solid var(--glass-border-subtle);
}

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

.result-item .q-num {
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 500;
}

.result-item .q-result {
  font-size: 14px;
  font-weight: 600;
}

.result-item .q-result.correct {
  color: var(--apple-green);
}

.result-item .q-result.wrong {
  color: var(--apple-red);
}

/* ============================================
   排行榜
   ============================================ */
#leaderboard-screen .screen-content {
  padding-top: calc(16px + env(safe-area-inset-top));
}

.leaderboard-header {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: 24px;
  margin-top: 40px;
}

.leaderboard-header h2 {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.btn-icon {
  background: var(--glass-thin);
  border: 0.5px solid var(--glass-border-subtle);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-primary);
  transition: all 0.2s var(--ease-out);
}

.btn-icon:active {
  transform: scale(0.92);
  background: var(--glass-medium);
}

.btn-icon svg {
  width: 18px;
  height: 18px;
  stroke-width: 2.5;
}

/* 返回按钮 */
.back-btn {
  position: absolute;
  top: calc(16px + env(safe-area-inset-top));
  left: 20px;
  background: var(--glass-thin);
  border: 0.5px solid var(--glass-border-subtle);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-primary);
  transition: all 0.2s var(--ease-out);
  z-index: 101;
  padding: 0;
}

.back-btn:active {
  transform: scale(0.92);
  background: var(--glass-medium);
}

.back-btn svg {
  width: 18px;
  height: 18px;
  stroke-width: 2.5;
}

/* 答题页返回按钮位置调整 */
.quiz-back-btn {
  position: fixed;
  top: calc(16px + env(safe-area-inset-top));
  left: 20px;
  z-index: 101;
}

.leaderboard-list {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  margin-bottom: 16px;
}

.leaderboard-item {
  display: flex;
  align-items: center;
  background: var(--glass-thin);
  border: 0.5px solid var(--glass-border-subtle);
  border-radius: var(--radius-md);
  padding: 16px;
  margin-bottom: 10px;
  transition: all 0.2s var(--ease-out);
}

.leaderboard-item:hover {
  background: var(--glass-medium);
  transform: translateX(4px);
}

.leaderboard-item.current-user {
  background: rgba(0, 122, 255, 0.1);
  border-color: var(--apple-blue);
}

.rank {
  font-size: 20px;
  font-weight: 700;
  width: 44px;
  text-align: center;
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}

.rank.gold {
  background: linear-gradient(180deg, #FFD700 0%, #FFA500 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.rank.silver {
  background: linear-gradient(180deg, #C0C0C0 0%, #A0A0A0 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.rank.bronze {
  background: linear-gradient(180deg, #CD7F32 0%, #8B5A2B 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.leaderboard-info {
  flex: 1;
  min-width: 0;
}

.user-name {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  letter-spacing: -0.3px;
}

.user-stats {
  display: flex;
  gap: 14px;
  font-size: 13px;
  color: var(--text-tertiary);
  font-weight: 500;
}

.user-stats span {
  display: flex;
  align-items: center;
  gap: 4px;
}

.leaderboard-score {
  text-align: right;
  flex-shrink: 0;
  min-width: 60px;
}

.score-main {
  font-size: 20px;
  font-weight: 700;
  color: var(--apple-green);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.5px;
}

.score-sub {
  font-size: 11px;
  color: var(--text-tertiary);
  margin-top: 2px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.loading-spinner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  color: var(--text-tertiary);
  gap: 16px;
}

.spinner {
  width: 32px;
  height: 32px;
  border: 2px solid var(--glass-border);
  border-top-color: var(--apple-blue);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

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

.leaderboard-refresh {
  text-align: center;
  padding-top: 16px;
  border-top: 0.5px solid var(--glass-border-subtle);
}

/* ============================================
   Toast
   ============================================ */
.toast-container {
  position: fixed;
  top: calc(100px + env(safe-area-inset-top));
  left: 50%;
  transform: translateX(-50%);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}

.toast {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  color: var(--text-primary);
  padding: 12px 22px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  box-shadow: var(--shadow-medium);
  animation: toastIn 0.25s var(--ease-out);
  max-width: calc(100vw - 40px);
  text-align: center;
  border: 0.5px solid var(--glass-border);
  letter-spacing: -0.2px;
}

.toast.warning {
  background: rgba(255, 255, 255, 0.95);
  color: var(--apple-orange);
}

.toast.error {
  background: rgba(255, 255, 255, 0.95);
  color: var(--apple-red);
}

.toast.success {
  background: rgba(255, 255, 255, 0.95);
  color: var(--apple-green);
}

@keyframes toastIn {
  from {
    opacity: 0;
    transform: translateY(-12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.toast.hiding {
  animation: toastOut 0.25s var(--ease-out) forwards;
}

@keyframes toastOut {
  to {
    opacity: 0;
    transform: translateY(-12px);
  }
}

/* ============================================
   离线提示
   ============================================ */
.offline-notice {
  margin-top: 28px;
  text-align: center;
  padding: 14px 20px;
  background: var(--glass-thin);
  border-radius: var(--radius-md);
  border: 0.5px solid var(--glass-border-subtle);
}

.offline-badge {
  display: inline-block;
  padding: 4px 10px;
  background: rgba(255, 149, 0, 0.1);
  color: var(--apple-orange);
  border-radius: 14px;
  font-size: 11px;
  font-weight: 600;
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.6px;
}

.offline-notice p {
  font-size: 13px;
  color: var(--text-tertiary);
  font-weight: 400;
}

.offline-notice-fixed {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: 20px;
  font-size: 12px;
  color: var(--text-tertiary);
  z-index: 1000;
  pointer-events: none;
  border: 0.5px solid var(--glass-border-subtle);
}

.offline-notice-fixed .offline-badge {
  padding: 2px 8px;
  font-size: 10px;
  margin-bottom: 0;
}

/* ============================================
   响应式
   ============================================ */
@media (min-width: 768px) {
  .poster-container {
    max-width: 340px;
  }
  
  .title {
    font-size: 40px;
  }
  
  .btn-large {
    max-width: 360px;
  }
  
  .options-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
  }
  
  .option-btn {
    min-height: 88px;
  }
}

@media (min-width: 1024px) {
  .quiz-content {
    max-width: 680px;
    margin: 0 auto;
  }
  
  .options-container {
    max-width: 680px;
  }
}

@media (orientation: landscape) and (max-height: 500px) {
  #home-screen .screen-content {
    flex-direction: row;
    gap: 32px;
  }
  
  .poster-container {
    max-width: 180px;
  }
  
  .title, .subtitle {
    text-align: left;
  }
  
  .btn-group-vertical {
    flex-direction: row;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}