/* roulang page: index */
@import url('/assets/css/vendor/1ecd1de215-css2.css');

    :root {
      --primary: #1A5F7A;
      --primary-deep: #134B61;
      --accent: #F9A826;
      --accent-light: rgba(249, 168, 38, 0.12);
      --bg: #F7F9FC;
      --surface: #FFFFFF;
      --title: #0F2B3D;
      --body: #4A5B6B;
      --muted: #7B8C9D;
      --border-light: #E5E9F0;
      --shadow-sm: 0 4px 12px rgba(15, 43, 61, 0.06);
      --shadow-md: 0 8px 24px rgba(15, 43, 61, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 20px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
      scroll-padding-top: 80px;
    }

    body {
      margin: 0;
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--body);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }

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

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

    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 导航 */
    .navbar {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      height: 72px;
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 0.3rem;
      letter-spacing: -0.3px;
    }
    .logo i {
      color: var(--accent);
      font-size: 1.8rem;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2.5rem;
      font-weight: 500;
      color: var(--body);
    }

    .nav-links a {
      position: relative;
      padding: 0.25rem 0;
      font-size: 0.98rem;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.3s ease;
    }

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

    .nav-links a:hover::after {
      width: 100%;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      font-weight: 600;
      padding: 0.7rem 1.8rem;
      border-radius: var(--radius-btn);
      border: none;
      cursor: pointer;
      transition: all 0.25s ease;
      box-shadow: 0 4px 10px rgba(26, 95, 122, 0.3);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 0.95rem;
      white-space: nowrap;
    }

    .btn-primary:hover {
      background: var(--primary-deep);
      box-shadow: 0 6px 18px rgba(26, 95, 122, 0.4);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      padding: 0.7rem 1.8rem;
      border-radius: var(--radius-btn);
      transition: all 0.25s;
    }
    .btn-outline:hover {
      background: rgba(26, 95, 122, 0.06);
    }

    .hamburger {
      display: none;
      font-size: 1.6rem;
      color: var(--title);
      background: none;
      border: none;
    }

    .mobile-menu {
      display: none;
      flex-direction: column;
      background: white;
      position: absolute;
      top: 72px;
      left: 0;
      width: 100%;
      padding: 1.5rem 1.5rem;
      box-shadow: var(--shadow-md);
      border-bottom: 1px solid var(--border-light);
    }
    .mobile-menu a {
      padding: 0.8rem 0;
      font-weight: 500;
      border-bottom: 1px solid #f0f3f8;
    }

    /* 板块间距 */
    section {
      padding: 5rem 0;
    }

    .section-tag {
      display: inline-block;
      background: var(--accent-light);
      color: #b46f0e;
      font-weight: 600;
      font-size: 0.8rem;
      padding: 0.3rem 1rem;
      border-radius: 20px;
      letter-spacing: 0.3px;
      margin-bottom: 1rem;
      text-transform: uppercase;
    }

    h2 {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--title);
      line-height: 1.3;
      margin-bottom: 1rem;
    }

    h3 {
      font-weight: 700;
      color: var(--title);
    }

    .card {
      background: var(--surface);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      height: 100%;
    }
    .card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }

    /* Hero */
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }
    .hero-title {
      font-size: 3.2rem;
      font-weight: 700;
      color: var(--title);
      line-height: 1.25;
    }
    .hero-stats {
      display: flex;
      gap: 2.5rem;
      margin: 2rem 0 1.8rem;
    }
    .stat-number {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.2;
    }

    /* 图片装饰 */
    .image-placeholder {
      background: #eef2f6;
      border-radius: 16px;
      overflow: hidden;
      position: relative;
    }
    .image-placeholder img {
      object-fit: cover;
      width: 100%;
      height: 100%;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 1.4rem 0;
    }
    .faq-question {
      font-weight: 700;
      font-size: 1.15rem;
      color: var(--title);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, margin 0.3s;
      color: var(--body);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 0.8rem;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.3fr;
      gap: 2rem;
    }

    @media (max-width: 1024px) {
      .hero-title {
        font-size: 2.6rem;
      }
      .nav-links {
        gap: 1.5rem;
      }
    }

    @media (max-width: 768px) {
      .container {
        padding-left: 20px;
        padding-right: 20px;
      }
      .nav-links, .nav-cta-desktop {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 2.4rem;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      section {
        padding: 3.5rem 0;
      }
      h2 {
        font-size: 2rem;
      }
    }