/* roulang page: index */
:root {
      --deep-gray-blue: #1E2A38;
      --signal-cyan: #00B4A6;
      --warm-copper: #C47E5A;
      --mist-white: #F4F6F9;
      --border-light: #E2E8F0;
      --text-primary: #1E2A38;
      --text-secondary: #4A5568;
      --text-muted: #718096;
      --card-shadow: 0 2px 8px rgba(0,0,0,0.04);
      --card-hover-shadow: 0 10px 25px rgba(0,0,0,0.08);
      --radius-sm: 6px;
      --radius-md: 8px;
      --radius-lg: 12px;
      --transition-base: all 0.2s ease;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
      background-color: var(--mist-white);
      color: var(--text-primary);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }
    
    /* 容器最大宽度与内边距 */
    .container-custom {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    
    @media (min-width: 768px) {
      .container-custom {
        padding-left: 2rem;
        padding-right: 2rem;
      }
    }
    
    /* 导航与频道标签 */
    .nav-link {
      position: relative;
      font-weight: 500;
      color: var(--text-secondary);
      transition: var(--transition-base);
      text-decoration: none;
      font-size: 0.95rem;
    }
    .nav-link:hover {
      color: var(--signal-cyan);
    }
    .channel-tag {
      background: transparent;
      border: 1px solid var(--border-light);
      color: var(--text-secondary);
      border-radius: 999px;
      padding: 0.3rem 1rem;
      font-size: 0.8rem;
      font-weight: 500;
      transition: var(--transition-base);
      white-space: nowrap;
    }
    .channel-tag:hover {
      border-color: var(--signal-cyan);
      color: var(--signal-cyan);
      background: rgba(0,180,166,0.04);
    }
    
    /* 卡片样式 */
    .feature-card {
      background: white;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      box-shadow: var(--card-shadow);
      padding: 1.8rem;
      transition: var(--transition-base);
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    .feature-card:hover {
      box-shadow: var(--card-hover-shadow);
      transform: translateY(-2px);
      border-color: rgba(0,180,166,0.25);
    }
    
    /* 案例卡片瀑布流基础 */
    .masonry-card {
      background: white;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      box-shadow: var(--card-shadow);
      overflow: hidden;
      transition: var(--transition-base);
      display: flex;
      flex-direction: column;
      height: fit-content;
    }
    .masonry-card:hover {
      box-shadow: var(--card-hover-shadow);
      transform: translateY(-3px);
    }
    
    /* 按钮 */
    .btn-primary {
      background-color: var(--signal-cyan);
      color: white;
      border: none;
      border-radius: var(--radius-sm);
      padding: 0.7rem 1.8rem;
      font-weight: 600;
      font-size: 0.95rem;
      transition: var(--transition-base);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      text-decoration: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background-color: #009B8E;
      color: white;
    }
    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--deep-gray-blue);
      color: var(--deep-gray-blue);
      border-radius: var(--radius-sm);
      padding: 0.7rem 1.8rem;
      font-weight: 600;
      font-size: 0.95rem;
      transition: var(--transition-base);
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      text-decoration: none;
      cursor: pointer;
    }
    .btn-secondary:hover {
      background: rgba(30,42,56,0.04);
    }
    
    /* 对比表高亮列 */
    .compare-highlight {
      border-left: 4px solid var(--signal-cyan);
      background: rgba(0,180,166,0.02);
    }
    
    /* FAQ 手风琴动画 */
    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.2s ease;
      background: #F8FAFC;
      border-radius: 0 0 var(--radius-sm) var(--radius-sm);
    }
    .faq-item.active .faq-content {
      max-height: 300px;
      padding: 1rem 1.5rem;
    }
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }
    
    /* 装饰性数据流背景点阵（轻量） */
    .dot-pattern {
      background-image: radial-gradient(circle, #CBD5E0 1px, transparent 1px);
      background-size: 20px 20px;
      opacity: 0.25;
    }
    
    /* 移动端导航汉堡菜单 */
    @media (max-width: 767px) {
      .mobile-menu {
        display: none;
        flex-direction: column;
        background: white;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        box-shadow: 0 10px 15px rgba(0,0,0,0.05);
        padding: 1rem 1.5rem;
        gap: 0.8rem;
      }
      .mobile-menu.open {
        display: flex;
      }
      .channel-row {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: thin;
        padding-bottom: 0.3rem;
      }
    }