/* roulang page: index */
:root {
      --primary: #1A5F7A;
      --primary-deep: #0E3B4B;
      --accent: #F39C12;
      --bg-page: #FAFBFB;
      --bg-light: #F4F6F8;
      --card-bg: #FFFFFF;
      --text-heading: #0E3B4B;
      --text-body: #2C3E50;
      --text-muted: #5D6D7E;
      --border-light: #D5DDE3;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 2px 12px rgba(14, 59, 75, 0.06);
      --shadow-hover: 0 8px 24px rgba(14, 59, 75, 0.12);
      --font-sans: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --spacing-section: 80px;
      --max-width: 1140px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-page);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 1rem;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, input, textarea {
      font-family: inherit;
    }

    h1, h2, h3, h4 {
      font-weight: 700;
      letter-spacing: -0.02em;
      color: var(--text-heading);
      line-height: 1.3;
    }

    h1 {
      font-size: 2.5rem;
    }
    h2 {
      font-size: 1.875rem;
    }
    h3 {
      font-size: 1.25rem;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    section {
      padding-top: var(--spacing-section);
      padding-bottom: var(--spacing-section);
    }

    /* 导航杂志频道风格 */
    .navbar-custom {
      background-color: #FFFFFF;
      box-shadow: 0 2px 12px rgba(0,0,0,0.03);
      position: sticky;
      top: 0;
      z-index: 1020;
    }
    .brand-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 14px 0;
      border-bottom: 1px solid #EDF2F5;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary-deep);
      text-decoration: none;
    }
    .logo-img {
      width: 40px;
      height: 40px;
      border-radius: 10px;
      background: url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
      background-color: var(--primary);
    }
    .brand-tagline {
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 400;
      margin-left: 8px;
    }
    .channel-nav {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 8px;
      padding: 12px 0;
    }
    .channel-nav .nav-link {
      padding: 8px 20px;
      border-radius: 30px;
      color: var(--text-body);
      font-weight: 500;
      transition: all 0.2s;
      background: transparent;
      font-size: 0.95rem;
    }
    .channel-nav .nav-link:hover {
      background-color: rgba(26,95,122,0.06);
      color: var(--primary);
    }
    .channel-nav .nav-link.active-anchor {
      color: var(--primary);
      background-color: rgba(26,95,122,0.08);
      box-shadow: inset 0 -2px 0 var(--accent);
      font-weight: 600;
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--primary-deep);
    }
    @media (max-width: 768px) {
      .channel-nav {
        display: none;
        flex-direction: column;
        width: 100%;
        background: white;
        border-radius: 16px;
        box-shadow: var(--shadow-hover);
        padding: 16px;
        margin-top: 8px;
      }
      .channel-nav.show {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .brand-row {
        flex-wrap: wrap;
      }
    }

    /* Hero */
    .hero-section {
      background-color: var(--bg-page);
      padding-top: 40px;
      padding-bottom: 40px;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .hero-image {
      width: 100%;
      height: 380px;
      border-radius: 24px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      background-color: #d9e4ea;
      box-shadow: var(--shadow-card);
    }
    .btn-primary-custom {
      background-color: var(--primary);
      border: none;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.2s;
      display: inline-block;
      text-align: center;
      border: 2px solid var(--primary);
    }
    .btn-primary-custom:hover {
      background-color: var(--primary-deep);
      border-color: var(--primary-deep);
      transform: scale(1.02);
      color: white;
    }
    .btn-outline-custom {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.2s;
      display: inline-block;
      text-align: center;
    }
    .btn-outline-custom:hover {
      background-color: rgba(26,95,122,0.06);
      border-color: var(--primary-deep);
      color: var(--primary-deep);
    }

    /* 指标卡片 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .metric-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 28px 20px;
      box-shadow: var(--shadow-card);
      text-align: center;
      transition: 0.2s;
    }
    .metric-card:hover {
      box-shadow: var(--shadow-hover);
    }
    .metric-number {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.2;
    }
    .metric-label {
      font-weight: 600;
      color: var(--text-heading);
      margin: 8px 0 4px;
    }
    .metric-desc {
      color: var(--text-muted);
      font-size: 0.9rem;
    }

    /* 服务卡片网格 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 28px 24px;
      box-shadow: var(--shadow-card);
      transition: all 0.2s;
      display: flex;
      flex-direction: column;
      align-items: flex-start;
    }
    .service-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .service-icon {
      width: 56px;
      height: 56px;
      border-radius: 16px;
      background-size: cover;
      background-position: center;
      margin-bottom: 20px;
      background-color: #e9f0f4;
    }
    .service-link {
      margin-top: 16px;
      font-weight: 600;
      color: var(--primary);
      font-size: 0.9rem;
    }

    /* 对比区块 */
    .compare-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .compare-col {
      padding: 32px;
      border-radius: 20px;
    }
    .compare-before {
      background-color: #F4F6F8;
    }
    .compare-after {
      background-color: rgba(26,95,122,0.06);
      border: 1px solid var(--primary);
    }
    .compare-list {
      list-style: none;
      padding: 0;
      margin-top: 20px;
    }
    .compare-list li {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
      font-size: 1rem;
    }
    .compare-list i {
      font-size: 1.4rem;
    }

    /* FAQ */
    .accordion-custom .accordion-item {
      border: none;
      border-bottom: 1px solid #E2E8F0;
      background: transparent;
    }
    .accordion-custom .accordion-button {
      font-weight: 600;
      color: var(--text-heading);
      background: transparent;
      box-shadow: none;
      padding: 20px 0;
      font-size: 1.1rem;
    }
    .accordion-custom .accordion-button:not(.collapsed) {
      color: var(--primary);
      background: transparent;
    }
    .accordion-custom .accordion-body {
      padding: 0 0 20px;
      color: var(--text-body);
    }

    /* 表单 */
    .form-section {
      background-color: var(--bg-light);
      border-radius: 28px;
      padding: 48px;
    }
    .form-control-custom {
      border-radius: 8px;
      border: 1px solid var(--border-light);
      padding: 12px 16px;
      font-size: 1rem;
      transition: 0.2s;
    }
    .form-control-custom:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(26,95,122,0.15);
    }

    /* Footer */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.4rem;
      color: var(--primary-deep);
    }

    @media (max-width: 992px) {
      .metrics-grid { grid-template-columns: repeat(2, 1fr); }
      .services-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      h1 { font-size: 1.8rem; }
      h2 { font-size: 1.5rem; }
      .hero-grid { grid-template-columns: 1fr; }
      .hero-image { height: 250px; order: -1; }
      .metrics-grid { grid-template-columns: 1fr; }
      .services-grid { grid-template-columns: 1fr; }
      .compare-container { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .form-section { padding: 28px; }
    }
    @media (max-width: 576px) {
      .btn-primary-custom, .btn-outline-custom { width: 100%; display: block; }
    }