/* roulang page: index */
:root {
      --primary: #E53935;
      --primary-dark: #C62828;
      --secondary: #1E2A38;
      --accent: #FFB300;
      --bg-light: #F8FAFC;
      --card-bg: #FFFFFF;
      --text-main: #1E2A38;
      --text-soft: #4B5563;
      --text-light: #9CA3AF;
      --border-light: #E5E7EB;
      --shadow-sm: 0 1px 2px 0 rgba(0,0,0,0.05);
      --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -1px rgba(0,0,0,0.04);
      --shadow-lg: 0 10px 25px -3px rgba(0,0,0,0.08), 0 4px 6px -2px rgba(0,0,0,0.04);
      --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.02);
      --radius-lg: 1.5rem;
      --radius-md: 1rem;
      --radius-sm: 0.5rem;
    }
    * {
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      scroll-padding-top: 140px;
    }
    body {
      margin: 0;
      font-family: system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, 'Noto Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
    }
    .container-custom {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    /* 导航杂志频道风格 */
    .navbar {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      box-shadow: var(--shadow-sm);
      border-bottom: 1px solid var(--border-light);
    }
    .brand-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding-top: 0.9rem;
      padding-bottom: 0.9rem;
    }
    .logo-text {
      font-size: 1.8rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: var(--secondary);
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .logo-text i {
      color: var(--primary);
      font-size: 2rem;
    }
    .channel-row {
      display: flex;
      align-items: center;
      gap: 1.8rem;
      padding-top: 0.6rem;
      padding-bottom: 0.6rem;
      border-top: 1px solid var(--border-light);
      overflow-x: auto;
      white-space: nowrap;
      scrollbar-width: thin;
    }
    .channel-row a {
      font-weight: 600;
      font-size: 0.95rem;
      color: var(--text-soft);
      position: relative;
      padding-bottom: 4px;
      transition: color 0.2s;
      text-transform: uppercase;
      letter-spacing: 0.3px;
    }
    .channel-row a:hover {
      color: var(--primary);
    }
    .channel-row a.active {
      color: var(--primary);
      border-bottom: 2px solid var(--primary);
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--secondary);
    }
    .mobile-nav {
      display: none;
      flex-direction: column;
      background: white;
      padding: 1rem 1.5rem;
      border-top: 1px solid var(--border-light);
    }
    .mobile-nav a {
      padding: 0.8rem 0;
      font-weight: 600;
      border-bottom: 1px solid #f1f5f9;
      color: var(--text-main);
    }
    /* 卡片与组件 */
    .feature-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 2rem 1.8rem;
      box-shadow: var(--shadow-md);
      transition: all 0.3s ease;
      border: 1px solid transparent;
    }
    .feature-card:hover {
      box-shadow: var(--shadow-xl);
      transform: translateY(-6px);
      border-color: #fee2e2;
    }
    .pricing-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 2.5rem 1.8rem;
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-light);
      transition: all 0.3s;
      display: flex;
      flex-direction: column;
    }
    .pricing-card.recommended {
      border: 2px solid var(--primary);
      box-shadow: var(--shadow-lg);
      transform: scale(1.02);
      background: #fffbfb;
    }
    .badge-accent {
      background: rgba(255,179,0,0.15);
      color: #b45309;
      font-weight: 700;
      padding: 0.25rem 0.9rem;
      border-radius: 999px;
      font-size: 0.8rem;
      display: inline-flex;
      align-items: center;
      gap: 0.3rem;
    }
    .data-badge {
      background: rgba(30,42,56,0.75);
      backdrop-filter: blur(8px);
      color: white;
      padding: 0.5rem 1.2rem;
      border-radius: 999px;
      font-weight: 700;
      display: inline-flex;
      align-items: center;
      gap: 0.4rem;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      width: 100%;
      background: transparent;
      border: none;
      text-align: left;
      padding: 1.3rem 0;
      font-weight: 700;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--secondary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.4s;
      color: var(--text-soft);
      line-height: 1.7;
    }
    .faq-answer.open {
      max-height: 200px;
      padding-bottom: 1.5rem;
    }
    @media (max-width: 768px) {
      .channel-row {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .mobile-nav.show {
        display: flex;
      }
      .container-custom {
        padding-left: 1.2rem;
        padding-right: 1.2rem;
      }
      .brand-row {
        padding-top: 0.7rem;
        padding-bottom: 0.7rem;
      }
    }
    .hero-bg {
      background-image: linear-gradient(rgba(248,250,252,0.7), rgba(248,250,252,0.9)), url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
    }