/* 全局样式 */
  body {
    font-family: "Microsoft Yahei", sans-serif;
    background-color: #f5f6fa;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
  }

  /* 顶部导航（含子菜单样式） */
  header {
    background-color: #fff;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
  }

  .nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 15px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  .logo {
    font-size: 22px;
    font-weight: bold;
    color: #EF534F;
  }

  /* 主导航容器 - 改为相对定位以承载子菜单 */
  .main-nav {
    flex: 1;
    display: flex;
    justify-content: center;
    gap: 30px;
  }

  /* 导航项容器 - 相对定位，作为子菜单的定位参考 */
  .nav-item {
    position: relative;
    list-style: none;
  }

  /* 子菜单默认隐藏 */
.nav-item ul {
  display: none;
  position: absolute;
  top: 100%; /* 紧贴主菜单底部 */
  left: 0;
}

/* 鼠标悬停主菜单时显示子菜单 */
.nav-item:hover > ul {
  display: block;
}

/* 防止空隙导致 hover 丢失 */
.nav-item ul {
  margin-top: 0; /* 确保子菜单紧贴父项 */
}

.external-link {
    color: #EF534F;  /* 设置字体颜色 */
    font-weight: 600; /* 稍微加粗 */
    text-decoration: none; /* 可选：去掉默认下划线 */
}

  /* 主导航链接样式 */
  .nav-item > a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    padding: 8px 0;
    display: inline-block;
  }

  .nav-item > a:hover {
    color: #EF534F;
  }

  /* 子菜单样式 - 默认隐藏 */
  .submenu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 280px;
    background-color: #ffffff;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    border-radius: 6px;
    padding: 10px 0;
    margin-top: 5px;
    display: none;
    z-index: 1001; /* 确保子菜单在其他元素之上 */
  }

  /* 子菜单链接样式 */
  .submenu li {
    list-style: none;
  }

  .submenu a {
    text-decoration: none;
    color: #000000;
    padding: 8px 20px;
    display: block;
  }

  .submenu a:hover {
    background-color: #f0f7ff;
    color: #EF534F;
  }

  /*  hover 显示子菜单 */
  .nav-item:hover .submenu {
    display: block;
  }

  .btn-primary {
    background-color: #EF534F;
    color: #fff;
    border: none;
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
  }

  /* 页面布局 */
  .container {
    max-width: 1400px;
    margin: 120px auto 40px; /* ← 修改这里，顶部加 120px 左右 */
    display: grid;
    grid-template-columns: 220px 1fr 280px;
    gap: 20px;
    padding: 20px;
    flex: 1;
  }

  .card {
    background-color: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    padding: 20px;
  }

  /* 左侧目录和右侧商家推荐固定定位及自适应高度 */
  .sidebar-left, .sidebar-right {
    position: sticky;
    top: 100px; /* 距离顶部距离，与导航栏保持一致 */
    height: fit-content; /* 自适应内容高度 */
    align-self: start; /* 网格布局中顶部对齐 */
  }

  .sidebar-left h3, .sidebar-right h3 {
    margin-bottom: 15px;
    font-size: 18px;
    color: #333;
    position: static; /* 取消标题单独定位 */
  }

  .sidebar-left ul {
    list-style: none;
    padding: 0;
    margin: 0;
  }

  .sidebar-left li {
    margin-bottom: 10px;
  }

  .sidebar-left a {
    text-decoration: none;
    color: #000;
  }

  .sidebar-left a:hover {
    text-decoration: underline;
    color: #EF534F;
  }

  /* 商家推荐区 */
  .merchant-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
  }

  .merchant-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: #f9f9fb;
    border-radius: 10px;
    padding: 10px 15px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.05);
  }

  /* 右侧容器内保持 card 样式一致，但避免重复 .card 定义 */
.sidebar-right .card {
  margin-bottom: 16px; /* 卡片之间的间距 */
}

/* 标签卡片专用（继承 .card 的基础样式） */
.tag-card h3 {
  margin-bottom: 12px;
  font-size: 18px;
  color: #333;
}

/* 标签容器：换行、间距 */
.tag-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* 标签胶囊（与图片风格匹配） */
.tag-pill {
  appearance: none;
  border: none;
  outline: none;
  cursor: pointer;
  padding: 6px 12px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 13px;
  background: rgba(239,83,79,0.08); /* 浅粉底 */
  color: #EF534F; /* 主色文字 */
  box-shadow: 0 1px 0 rgba(239,83,79,0.06) inset, 0 2px 6px rgba(16,24,40,0.03);
  transition: transform 0.18s ease, background 0.18s ease, color 0.18s ease;
}

/* 标签 hover / active 状态 */
.tag-pill:hover {
  transform: translateY(-3px);
  background: #EF534F; /* 悬停变为主色 */
  color: #fff;
  box-shadow: 0 6px 18px rgba(239,83,79,0.14);
}

.tag-pill:active {
  transform: translateY(-1px) scale(0.995);
}

/* 小屏幕下：让右侧两个卡片在流式布局中表现更好 */
@media (max-width: 900px) {
  .sidebar-right .card {
    margin-bottom: 18px;
  }
  .tag-wrap { gap: 8px; }
  .tag-pill { padding: 6px 10px; font-size: 13px; }
}


  .merchant-info {
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .merchant-info img {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    object-fit: cover;
  }

  .merchant-name {
    font-size: 16px;
    font-weight: 600;
    color: #333;
  }

  .merchant-item button {
    background-color: #EF534F;
    color: #fff;
    border: none;
    border-radius: 6px;
    padding: 6px 12px;
    cursor: pointer;
  }

  .merchant-item button:hover {
    background-color: #EF534F;
  }

  /* 正文区域 */
  .content img {
    width: 100%;
    border-radius: 10px;
    margin-bottom: 20px;
  }

  .content h1 {
    font-size: 26px;
    color: #333;
    margin-bottom: 15px;
  }

  .content p {
    line-height: 1.8;
    color: #555;
    margin-bottom: 20px;
  }

  /* 返回顶部按钮 */
  #backToTop {
    position: fixed;
    bottom: 25px;
    right: 25px;
    background-color: #007bff;
    color: #fff;
    border: none;
    padding: 10px 14px;
    border-radius: 50%;
    cursor: pointer;
    display: none;
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
  }

  #backToTop:hover {
    background-color: #0056b3;
  }

  /* 页脚样式 */
  footer {
    background-color: #4d4d4d;
    border-top: 1px solid #eee;
    margin-top: 60px;
  }

  .footer-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 40px 20px 20px;
  }

  .footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 30px;
    justify-items: center;  /* 关键：让列内容居中 */
    text-align: center;     /* 关键：让文字居中 */
  }

  .footer-column h3 {
    color: #ffffff;
    font-size: 18px;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 10px;
    display: inline-block; /* 关键：让标题宽度与文字一致 */
  }

  .footer-column h3::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%; /* 横线与文字等宽 */
    height: 2px;
    background-color: #EF534F;
  }

  .footer-column ul {
    list-style: none;
    padding: 0;
    margin: 0;
  }

  .footer-column li {
    margin-bottom: 12px;
  }

  .footer-column a {
    color: #ffffff;
    text-decoration: none;
    transition: color 0.3s;
  }

  .footer-column a:hover {
    color: #EF534F;
  }

  .social-links {
    display: flex;
    gap: 15px;
    margin-top: 15px;
  }

  .social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: #f5f6fa;
    color: #666;
    transition: all 0.3s;
  }

  .social-links a:hover {
    background-color: #EF534F;
    color: #fff;
    transform: translateY(-3px);
  }

  .footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #eee;
    color: #888;
    font-size: 14px;
  }

  /* 响应式调整 */
  /* 中等屏幕：隐藏侧边栏，只显示主内容 */
  @media (max-width: 1200px) {
    .container {
      grid-template-columns: 1fr;
      padding: 20px;
    }
    .sidebar-left, .sidebar-right {
      display: none;
    }
  }

  @media (max-width: 900px) {
    .container {
      grid-template-columns: 1fr;
    }
    .sidebar-left, .sidebar-right {
      position: static; /* 小屏幕下恢复正常流布局 */
      max-height: none;
      overflow-y: visible;
    }
    /* 小屏幕导航调整 - 简化子菜单触发方式 */
    .main-nav {
      gap: 15px;
    }

    /* 页脚响应式调整 */
    .footer-content {
      grid-template-columns: 1fr 1fr;
    }
  }

  @media (max-width: 600px) {
    .footer-content {
      grid-template-columns: 1fr;
    }
    
    .main-nav {
      display: none; /* 在最小屏幕上可以考虑隐藏导航，或改为汉堡菜单 */
    }
  }

  /* ====== 正文基础样式 ====== */
main {
  color: #333;
  line-height: 1.8;
  font-size: 16px;
  max-width: 100%;
  margin: 0 auto;
}

main h2 {
  font-size: 24px;
  margin: 40px 0 16px;
  padding-left: 10px;
  border-left: 4px solid #EF534F;
  color: #222;
}

main h3 {
  font-size: 20px;
  margin: 28px 0 12px;
  color: #333;
}

/* 段落样式 */
main p {
  margin-bottom: 16px;
  color: #444;
  text-align: justify;
}

/* 分点样式（圆点） */
main ul {
  margin: 12px 0 20px 24px;
  list-style: none;
  padding: 0;
}
main ul li {
  position: relative;
  margin-bottom: 10px;
  padding-left: 18px;
}
main ul li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: #EF534F;
  font-weight: bold;
}

/* ====== 表格基础样式 ====== */
main table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 15px;
}
main th, main td {
  border: 1px solid #ddd;
  padding: 10px 14px;
  text-align: left;
}
main th {
  background: #f7f7f7;
  font-weight: 600;
  color: #333;
}
main tr:nth-child(even) {
  background-color: #fafafa;
}

/* ====== 优缺点对比表格 ====== */
.pros-cons {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
}
.pros-cons th {
  text-align: center;
  padding: 12px;
  font-size: 16px;
  background-color: #f5f5f5;
}
.pros-cons td {
  padding: 10px 14px;
  vertical-align: top;
  width: 50%;
}
.pros {
  background-color: rgba(46, 204, 113, 0.08);
  color: #2ecc71;
  border-left: 3px solid #2ecc71;
}
.cons {
  background-color: rgba(239, 83, 79, 0.08);
  color: #EF534F;
  border-left: 3px solid #EF534F;
}

/* ====== FAQ 折叠样式 ====== */
.faq {
  border: 1px solid #eee;
  border-radius: 10px;
  margin: 20px 0;
  overflow: hidden;
  box-shadow: 0 2px 6px rgba(0,0,0,0.04);
}
.faq-item {
  border-bottom: 1px solid #eee;
}
.faq-item:last-child {
  border-bottom: none;
}
.faq-question {
  background: #f9f9f9;
  cursor: pointer;
  padding: 14px 18px;
  font-weight: 600;
  color: #333;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background 0.2s ease;
}
.faq-question:hover {
  background: rgba(239,83,79,0.08);
}
.faq-answer {
  display: none;
  padding: 16px 20px;
  color: #555;
  line-height: 1.7;
}
.faq-item.active .faq-answer {
  display: block;
}
.faq-item.active .faq-question {
  background: rgba(239,83,79,0.1);
  color: #EF534F;
}

/* FAQ 图标（简单箭头） */
.faq-question::after {
  content: "▼";
  font-size: 12px;
  color: #888;
  transition: transform 0.2s ease;
}
.faq-item.active .faq-question::after {
  transform: rotate(-180deg);
  color: #EF534F;
}

.logo {
  display: flex;
  align-items: center;
  font-weight: 700;
  font-size: 1.4rem;
  text-decoration: none;
  color: #333;
}

.logo-icon {
  width: 28px;
  height: 28px;
  margin-right: 8px;
}
.logo:hover {
  opacity: 0.85;
}

/* ====== 优惠购买组件样式 ====== */
.promo-purchase-box {
  background: #fff;
  border-radius: 12px;
  padding: 24px;
  margin: 24px 0;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  border: 2px solid rgba(239, 83, 79, 0.1);
  transition: all 0.3s ease;
  box-sizing: border-box;
}

.promo-purchase-box:hover {
  border-color: rgba(239, 83, 79, 0.3);
  box-shadow: 0 6px 16px rgba(239, 83, 79, 0.1);
}

.promo-code-section {
  background: rgba(239, 83, 79, 0.04);
  border-radius: 10px;
  padding: 18px;
  margin-bottom: 16px;
  box-sizing: border-box;
}

.promo-label {
  font-size: 13px;
  color: #666;
  margin-bottom: 10px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
}

.promo-label i {
  color: #EF534F;
}

.promo-code-container {
  display: flex;
  gap: 10px;
  align-items: center;
}

.promo-code {
  flex: 1;
  background: #fff;
  border: 2px dashed #EF534F;
  border-radius: 8px;
  padding: 14px 16px;
  font-family: 'Courier New', monospace;
  font-size: 20px;
  font-weight: 700;
  color: #EF534F;
  text-align: center;
  letter-spacing: 3px;
  box-sizing: border-box;
}

.copy-btn {
  background: #EF534F;
  color: white;
  border: none;
  border-radius: 8px;
  padding: 14px 22px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.3s ease;
  white-space: nowrap;
  box-sizing: border-box;
}

.copy-btn:hover {
  background: #d64843;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(239, 83, 79, 0.3);
}

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

.copy-btn.copied {
  background: #2ecc71;
}

.purchase-btn {
  width: 100%;
  background: #EF534F;
  color: white;
  border: none;
  border-radius: 10px;
  padding: 16px 24px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  transition: all 0.3s ease;
  text-decoration: none;
  box-sizing: border-box;
}

.purchase-btn:hover {
  background: #d64843;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(239, 83, 79, 0.3);
}

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

/* 优惠码组件响应式设计 */
@media (max-width: 768px) {
  .promo-purchase-box {
    padding: 20px;
    margin: 20px 0;
  }

  .promo-code-container {
    flex-direction: column;
  }

  .promo-code {
    font-size: 18px;
    letter-spacing: 2px;
  }

  .copy-btn {
    width: 100%;
    justify-content: center;
    padding: 12px 20px;
  }
}