/* ============================================
   食品安全小卫士 — 共享样式表
   暗色主题 · 圆润 · 微动效 · 可爱
   ============================================ */

/* --- CSS 自定义属性（主题色） --- */
:root {
  --color-primary: #f8b4c8;
  --color-primary-light: #fbc4d6;
  --color-accent: #ff6b6b;
  --color-accent-light: #ff8e8e;
  --color-success: #b5e6c3;
  --color-danger: #f5a3a3;
  --color-bg-start: #fce4ec;
  --color-bg-end: #f3e5f5;
  --color-card: rgba(255, 255, 255, 0.5);
  --color-card-hover: rgba(255, 255, 255, 0.7);
  --color-text: #5d3a4b;
  --color-text-dim: #8d6b7a;
  --color-border: rgba(200, 160, 180, 0.25);
  --radius: 16px;
  --radius-sm: 10px;
  --shadow-card: 0 4px 24px rgba(200, 150, 180, 0.2);
  --shadow-hover: 0 12px 40px rgba(200, 150, 180, 0.3);
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", "Helvetica Neue", sans-serif;
  background: linear-gradient(135deg, var(--color-bg-start), var(--color-bg-end));
  color: var(--color-text);
  min-height: 100vh;
  line-height: 1.6;
  padding: 20px;
}

/* --- 渐变标题 --- */
.gradient-title {
  font-size: 2.4rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 0.5rem;
}

.gradient-title-sm {
  font-size: 1.6rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 0.4rem;
}

/* --- 导航栏 --- */
.nav-bar {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  gap: 6px;
  margin-bottom: 24px;
  padding: 10px 16px;
  background: rgba(255, 255, 255, 0.04);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  backdrop-filter: blur(8px);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.nav-bar .logo {
  font-size: 1.3rem;
  font-weight: 700;
  margin-right: auto;
  color: var(--color-primary-light);
}

.nav-bar a {
  color: var(--color-text-dim);
  text-decoration: none;
  font-size: 0.95rem;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.nav-bar a:hover {
  color: var(--color-text);
  background: rgba(255, 255, 255, 0.08);
}

.nav-bar a.active {
  color: var(--color-accent);
  background: rgba(245, 158, 11, 0.12);
}

/* --- 卡片（横版） --- */
.card-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 20px;
  justify-content: center;
}

.card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 18px 20px;
  box-shadow: var(--shadow-card);
  transition: var(--transition);
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  display: block;
  flex: 0 0 auto;
  width: 220px;
}

.card:hover {
  background: var(--color-card-hover);
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: var(--color-primary-light);
}

.card:active {
  transform: translateY(-2px);
}

.card .card-icon {
  font-size: 2.4rem;
  margin-bottom: 12px;
  display: block;
}

.card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-text);
}

.card p {
  font-size: 0.9rem;
  color: var(--color-text-dim);
  line-height: 1.5;
}

/* --- 按钮 --- */
.btn {
  display: inline-block;
  padding: 10px 24px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  color: #fff;
  background: #e85d75;
}

.btn:hover {
  background: var(--color-primary-light);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(124, 58, 237, 0.35);
}

.btn:active {
  transform: translateY(0);
}

.btn-accent {
  background: var(--color-accent);
  color: #1a1040;
}

.btn-accent:hover {
  background: var(--color-accent-light);
  box-shadow: 0 6px 20px rgba(245, 158, 11, 0.35);
}

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

.btn-danger:hover {
  background: #f87171;
  box-shadow: 0 6px 20px rgba(239, 68, 68, 0.35);
}

/* --- 内容容器 --- */
.container {
  max-width: 960px;
  margin: 0 auto;
}

/* --- 页面头部 --- */
.page-header {
  text-align: center;
  margin-bottom: 32px;
}

.page-header p {
  color: var(--color-text-dim);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto;
}

/* --- 返回链接 --- */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-text-dim);
  text-decoration: none;
  font-size: 0.95rem;
  margin-bottom: 20px;
  transition: var(--transition);
}

.back-link:hover {
  color: var(--color-primary-light);
}

/* --- 列表样式 --- */
.info-list {
  list-style: none;
  padding: 0;
}

.info-list li {
  padding: 14px 18px;
  margin-bottom: 10px;
  background: var(--color-card);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  font-size: 0.95rem;
  transition: var(--transition);
}

.info-list li:hover {
  background: var(--color-card-hover);
  border-color: var(--color-primary-light);
}

/* --- 测验相关 --- */
.quiz-question {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 16px;
}

.quiz-question h3 {
  margin-bottom: 12px;
  font-size: 1.1rem;
}

.quiz-option {
  display: block;
  padding: 10px 16px;
  margin-bottom: 8px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  font-size: 0.95rem;
}

.quiz-option:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--color-primary-light);
}

.quiz-option.selected {
  border-color: var(--color-primary);
  background: rgba(124, 58, 237, 0.15);
}

.quiz-option.correct {
  border-color: var(--color-success);
  background: rgba(16, 185, 129, 0.15);
}

.quiz-option.wrong {
  border-color: var(--color-danger);
  background: rgba(239, 68, 68, 0.15);
}

.quiz-result {
  text-align: center;
  padding: 32px;
  background: var(--color-card);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  margin-top: 20px;
}

.quiz-result .score {
  font-size: 2.8rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* --- 撒花动画 --- */
@keyframes confetti-fall {
  0% { transform: translateY(0) rotate(0deg); opacity: 1; }
  100% { transform: translateY(100vh) rotate(720deg); opacity: 0; }
}

/* --- 分数弹出动画 --- */
@keyframes score-pop {
  0% { transform: scale(0.3); opacity: 0; }
  50% { transform: scale(1.3); }
  100% { transform: scale(1); opacity: 1; }
}
.score-pop {
  animation: score-pop 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

/* --- 倒计时警告闪烁 --- */
@keyframes timer-warn {
  0%, 100% { color: var(--color-accent); }
  50% { color: #ef4444; transform: scale(1.15); }
}
.timer-warning {
  animation: timer-warn 0.5s ease-in-out infinite;
}

/* --- 页脚 --- */
footer {
  text-align: center;
  padding: 24px 0;
  margin-top: 48px;
  color: var(--color-text-dim);
  font-size: 0.85rem;
  border-top: 1px solid var(--color-border);
}

/* --- 响应式 --- */
@media (max-width: 640px) {
  body {
    padding: 12px;
  }

  .gradient-title {
    font-size: 1.6rem;
  }

  .gradient-title-sm {
    font-size: 1.2rem;
  }

  .card-grid {
    display: flex !important;
    flex-wrap: nowrap !important;
    overflow-x: auto !important;
    -webkit-overflow-scrolling: touch;
    gap: 12px;
    padding-bottom: 8px;
    scroll-snap-type: x mandatory;
    width: 100%;
  }
  .card {
    flex: 0 0 auto !important;
    width: 160px;
    scroll-snap-align: start;
  }

  .nav-bar {
    flex-direction: row;
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    gap: 4px;
    padding: 8px 12px;
    align-items: center;
  }
  .nav-bar .logo {
    flex-shrink: 0;
    margin-right: 4px;
    font-size: 1rem;
  }
  .nav-bar a {
    flex-shrink: 0;
    font-size: 0.85rem;
    padding: 4px 10px;
    white-space: nowrap;
  }
}