/* roulang page: index */
:root {
      --primary: #0A4C7B;
      --primary-dark: #083B5E;
      --accent: #F5A623;
      --bg-page: #FAFBFD;
      --bg-card: #FFFFFF;
      --text-heading: #0B1E33;
      --text-body: #3A4A5C;
      --text-muted: #6B7B8D;
      --border-light: #E5E9F0;
      --shadow-sm: 0 1px 3px rgba(10,76,123,0.06), 0 4px 12px rgba(10,76,123,0.04);
      --shadow-hover: 0 4px 12px rgba(10,76,123,0.1), 0 8px 24px rgba(10,76,123,0.06);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-search: 24px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", system-ui, sans-serif;
      --spacing-section: 80px;
      --container-max: 1200px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: var(--font-sans);
      background-color: var(--bg-page);
      color: var(--text-body);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .site-header {
      background-color: #FFFFFF;
      border-bottom: 1px solid var(--border-light);
      position: sticky;
      top: 0;
      z-index: 50;
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      padding: 16px 0;
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .logo-text {
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 1px;
    }

    .search-wrapper {
      flex: 1;
      max-width: 420px;
      margin: 0 24px;
      position: relative;
    }

    .search-input {
      width: 100%;
      padding: 12px 20px 12px 48px;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-search);
      background: #FFFFFF;
      font-size: 0.95rem;
      color: var(--text-body);
      outline: none;
      transition: border 0.2s, box-shadow 0.2s;
    }

    .search-input:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(10,76,123,0.1);
    }

    .search-icon {
      position: absolute;
      left: 18px;
      top: 50%;
      transform: translateY(-50%);
      color: var(--primary);
      font-size: 1.1rem;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text-body);
      white-space: nowrap;
    }

    .nav-links a:hover {
      color: var(--primary);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.6rem;
      color: var(--primary);
      cursor: pointer;
      padding: 4px 8px;
    }

    /* 区块标题 */
    .section-title {
      font-size: 2rem;
      font-weight: 600;
      color: var(--text-heading);
      margin-bottom: 16px;
      text-align: center;
    }

    .section-sub {
      color: var(--text-muted);
      text-align: center;
      max-width: 700px;
      margin: 0 auto 40px;
      font-size: 1.1rem;
    }

    section {
      padding: var(--spacing-section) 0;
    }

    /* 按钮 */
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-block;
      transition: background 0.2s, transform 0.1s, box-shadow 0.2s;
      border: none;
      cursor: pointer;
      box-shadow: 0 4px 10px rgba(10,76,123,0.2);
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-1px);
      box-shadow: 0 8px 18px rgba(10,76,123,0.25);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-block;
      transition: all 0.2s;
    }

    .btn-outline:hover {
      background: rgba(10,76,123,0.08);
    }

    .btn-accent {
      background: var(--accent);
      color: #0B1E33;
      font-weight: 700;
      box-shadow: 0 4px 12px rgba(245,166,35,0.3);
    }

    .btn-accent:hover {
      background: #e5940f;
      transform: translateY(-1px);
    }

    /* 卡片 */
    .card {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      padding: 24px;
      transition: box-shadow 0.3s, transform 0.2s;
      height: 100%;
    }

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

    /* Hero */
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
      background: linear-gradient(135deg, #FAFBFD 0%, #EEF3F8 100%);
      border-radius: 32px;
      padding: 40px;
      margin-top: 24px;
    }

    .hero-left {
      flex: 1 1 55%;
    }

    .hero-right {
      flex: 1 1 45%;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .hero-right img {
      border-radius: 24px;
      box-shadow: 0 20px 35px rgba(10,76,123,0.15);
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    h1 {
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--text-heading);
      line-height: 1.3;
      margin-bottom: 16px;
    }

    /* 数据块 */
    .stat-number {
      font-size: 2.3rem;
      font-weight: 700;
      color: var(--primary);
    }

    .stat-symbol {
      color: var(--accent);
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
      cursor: pointer;
    }

    .faq-question {
      font-weight: 600;
      color: var(--text-heading);
      display: flex;
      justify-content: space-between;
      align-items: center;
      position: relative;
      padding-left: 16px;
    }

    .faq-question::before {
      content: '';
      position: absolute;
      left: 0;
      top: 4px;
      height: 20px;
      width: 4px;
      background: var(--primary);
      border-radius: 2px;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-body);
      padding-left: 16px;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }

    /* 全局CTA */
    .cta-banner {
      background: var(--primary);
      border-radius: 28px;
      padding: 48px;
      text-align: center;
      color: white;
    }

    footer a {
      color: var(--text-muted);
      font-size: 0.9rem;
    }

    footer a:hover {
      color: var(--primary);
    }

    @media (max-width: 1024px) {
      .hero-grid {
        flex-direction: column;
        padding: 32px;
      }
      .search-wrapper {
        max-width: 300px;
        margin: 0 16px;
      }
    }

    @media (max-width: 768px) {
      :root {
        --spacing-section: 48px;
      }

      .nav-container {
        flex-wrap: wrap;
      }

      .search-wrapper {
        order: 3;
        width: 100%;
        max-width: 100%;
        margin: 12px 0 0 0;
      }

      .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        gap: 12px;
        margin-top: 16px;
        background: #fff;
        padding: 16px;
        border-radius: 16px;
        box-shadow: var(--shadow-sm);
      }

      .nav-links.show {
        display: flex;
      }

      .menu-toggle {
        display: block;
      }

      h1 {
        font-size: 1.9rem;
      }

      .hero-grid {
        padding: 24px;
      }
    }