/* roulang page: index */
:root {
      --primary: #0B5E8A;
      --accent-orange: #F85C3A;
      --accent-green: #1DD1A1;
      --bg-light: #F9FAFC;
      --card-bg: #FFFFFF;
      --text-dark: #1E293B;
      --text-medium: #475569;
      --text-light: #94A3B8;
      --border-light: #E2E8F0;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.02);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.08), 0 4px 8px rgba(0,0,0,0.04);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      transition: all 0.2s ease;
    }

    .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 {
      background: white;
      border-bottom: 1px solid var(--border-light);
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
      position: sticky;
      top: 0;
      z-index: 50;
    }

    .brand-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0.75rem 0;
      border-bottom: 1px solid #f1f5f9;
    }

    .logo-text {
      font-size: 1.75rem;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    .logo-icon {
      font-size: 2rem;
      color: var(--accent-orange);
    }

    .channel-row {
      display: flex;
      align-items: center;
      justify-content: center;
      flex-wrap: wrap;
      gap: 0.5rem;
      padding: 0.5rem 0;
    }

    .channel-link {
      padding: 0.5rem 1rem;
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-medium);
      border-radius: 20px;
      transition: 0.2s;
      white-space: nowrap;
    }

    .channel-link:hover {
      color: var(--primary);
      background: #f1f5f9;
    }

    .channel-link.active {
      color: var(--accent-orange);
      border-bottom: 3px solid var(--accent-orange);
      border-radius: 0;
      background: transparent;
      font-weight: 600;
    }

    .nav-cta-micro {
      background: var(--accent-orange);
      color: white;
      padding: 0.5rem 1.25rem;
      border-radius: 20px;
      font-weight: 600;
      font-size: 0.9rem;
      border: none;
      white-space: nowrap;
      margin-left: 0.5rem;
    }

    .nav-cta-micro:hover {
      background: #E04A2A;
      box-shadow: 0 0 0 3px rgba(248,92,58,0.3);
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--text-dark);
    }

    @media (max-width: 768px) {
      .hamburger {
        display: block;
      }
      .channel-row {
        display: none;
        flex-direction: column;
        align-items: flex-start;
        background: white;
        padding: 1rem;
        gap: 0.75rem;
        border-top: 1px solid var(--border-light);
      }
      .channel-row.open {
        display: flex;
      }
      .brand-row {
        border-bottom: none;
      }
      .nav-cta-micro {
        margin-left: 0;
      }
    }

    /* 按钮系统 */
    .btn-primary {
      background: var(--accent-orange);
      color: white;
      border-radius: var(--radius-btn);
      padding: 0.75rem 2rem;
      font-weight: 600;
      border: none;
      display: inline-block;
      text-align: center;
      box-shadow: 0 4px 10px rgba(248,92,58,0.2);
    }

    .btn-primary:hover {
      background: #E04A2A;
      box-shadow: 0 0 0 3px rgba(248,92,58,0.3);
      transform: translateY(-1px);
    }

    .btn-secondary {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      border-radius: var(--radius-btn);
      padding: 0.65rem 1.8rem;
      font-weight: 600;
    }

    .btn-secondary:hover {
      background: rgba(11,94,138,0.05);
    }

    /* 卡片统一 */
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      height: 100%;
      display: flex;
      flex-direction: column;
    }

    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }

    .card-body {
      padding: 1.5rem 1.8rem;
      flex: 1;
    }

    /* 手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 1.2rem 0;
    }

    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--text-dark);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-medium);
      padding-right: 2rem;
    }

    .faq-answer.open {
      max-height: 200px;
      margin-top: 0.75rem;
    }

    .faq-icon {
      font-size: 1.5rem;
      color: var(--accent-orange);
    }

    footer {
      background: #0f172a;
      color: #cbd5e1;
      padding: 3rem 0 1.5rem;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
      margin-bottom: 2rem;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
      h1 {
        font-size: 2.5rem !important;
      }
      h2 {
        font-size: 1.8rem !important;
      }
    }

    .section-padding {
      padding: 5rem 0;
    }

    @media (max-width: 640px) {
      .section-padding {
        padding: 3rem 0;
      }
    }