/* roulang page: index */
:root {
      --primary: #1A5FDC;
      --primary-hover: #1551C8;
      --secondary: #FF6B35;
      --secondary-hover: #E55A28;
      --bg-page: #FFFFFF;
      --bg-soft: #F5F8FC;
      --bg-dark: #0F1A2E;
      --text-heading: #0A1525;
      --text-body: #334155;
      --text-muted: #64748B;
      --text-on-dark: #CBD5E1;
      --border-light: #E2E8F0;
      --shadow-card: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 8px 30px rgba(26,95,220,0.12);
      --shadow-nav: 0 1px 3px rgba(0,0,0,0.04);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-pill: 50px;
      --radius-btn: 8px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, 'Inter', sans-serif;
      --transition: 0.2s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-page);
      color: var(--text-body);
      line-height: 1.6;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

    .container {
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    /* 导航栏样式 */
    .navbar {
      height: 72px;
      background: white;
      box-shadow: var(--shadow-nav);
      position: sticky;
      top: 0;
      z-index: 50;
      display: flex;
      align-items: center;
    }
    .nav-logo {
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary);
      white-space: nowrap;
      display: flex;
      align-items: center;
      gap: 0.25rem;
    }
    .search-box {
      background: #F1F5F9;
      border-radius: var(--radius-pill);
      padding: 0.5rem 1.25rem;
      display: flex;
      align-items: center;
      gap: 0.5rem;
      border: 1px solid transparent;
      transition: var(--transition);
      width: 320px;
      height: 44px;
    }
    .search-box i {
      color: var(--primary);
      font-size: 1rem;
    }
    .search-box input {
      background: transparent;
      border: none;
      outline: none;
      font-size: 0.875rem;
      color: var(--text-body);
      width: 100%;
    }
    .search-box input::placeholder {
      color: #94A3B8;
      font-weight: 400;
    }
    .search-box:focus-within {
      background: white;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(26,95,220,0.1);
    }
    .nav-link {
      font-size: 0.875rem;
      font-weight: 500;
      color: var(--text-body);
      padding: 0.5rem 0.75rem;
      border-radius: 6px;
      transition: var(--transition);
    }
    .nav-link:hover {
      color: var(--primary);
      background: rgba(26,95,220,0.04);
    }

    /* 按钮体系 */
    .btn-primary {
      background: var(--primary);
      color: white;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.875rem 2rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: var(--transition);
      border: none;
      cursor: pointer;
      box-shadow: none;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: 0 4px 12px rgba(26,95,220,0.25);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.875rem 2rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
      box-shadow: 0 4px 12px rgba(26,95,220,0.2);
      transform: translateY(-1px);
    }
    .btn-white {
      background: white;
      color: var(--primary);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.875rem 2rem;
      transition: var(--transition);
      border: none;
    }
    .btn-white:hover {
      background: #f0f4ff;
      box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    }
    .btn-ghost-white {
      background: transparent;
      border: 1.5px solid white;
      color: white;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.875rem 2rem;
      transition: var(--transition);
    }
    .btn-ghost-white:hover {
      background: white;
      color: var(--primary);
    }

    /* 卡片样式 */
    .service-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 2rem;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      height: 100%;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    .icon-box {
      width: 48px;
      height: 48px;
      background: rgba(26,95,220,0.08);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 1.5rem;
      margin-bottom: 1.5rem;
      transition: var(--transition);
    }
    .service-card:hover .icon-box {
      background: var(--primary);
      color: white;
    }

    .case-card {
      background: white;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    .case-img {
      transition: transform 0.3s ease;
    }
    .case-card:hover .case-img {
      transform: scale(1.03);
    }

    /* FAQ手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      cursor: pointer;
      padding: 1.25rem 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 1.125rem;
      color: var(--text-heading);
      transition: var(--transition);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      color: var(--text-muted);
      line-height: 1.7;
      padding: 0 0;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 0 1.5rem 0;
    }
    .faq-item.active .faq-question {
      color: var(--primary);
    }
    .faq-icon {
      transition: transform 0.2s;
      color: var(--primary);
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 数据数字 */
    .stat-number {
      font-size: 3rem;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.2;
    }

    @media (max-width: 1024px) {
      .search-box {
        width: 200px;
      }
      .hero-title {
        font-size: 2.5rem;
      }
    }
    @media (max-width: 768px) {
      .navbar {
        flex-wrap: wrap;
        height: auto;
        padding: 1rem 0;
      }
      .search-box {
        width: 100%;
        order: 3;
        margin-top: 0.75rem;
      }
      .hero-title {
        font-size: 2rem;
      }
    }