/* roulang page: index */
:root {
      --primary: #1A5FDC;
      --primary-light: #0EA5E9;
      --accent: #F59E0B;
      --bg: #F8FAFC;
      --card-bg: #FFFFFF;
      --text-dark: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --border: #E2E8F0;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
      --shadow-hover: 0 10px 25px rgba(26,95,220,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
      --font-number: "Inter", "Poppins", sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-body);
      line-height: 1.75;
      margin: 0;
      padding-top: 70px;
    }

    h1, h2, h3, h4, .h1, .h2, .h3 {
      font-weight: 700;
      color: var(--text-dark);
    }

    h1 {
      font-size: 48px;
      line-height: 1.2;
    }

    h2 {
      font-size: 36px;
      line-height: 1.3;
    }

    h3 {
      font-size: 22px;
      font-weight: 600;
      line-height: 1.4;
    }

    .text-muted-custom {
      color: var(--text-muted);
    }

    .bg-primary-gradient {
      background: linear-gradient(135deg, var(--primary), var(--primary-light));
    }

    .btn {
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
      transition: all 0.25s ease;
      border: 2px solid transparent;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

    .btn-primary-gradient {
      background: linear-gradient(135deg, var(--primary), var(--primary-light));
      border: none;
      color: white;
      box-shadow: 0 4px 12px rgba(26,95,220,0.3);
    }

    .btn-primary-gradient:hover {
      filter: brightness(1.1);
      box-shadow: 0 8px 20px rgba(26,95,220,0.4);
      transform: translateY(-2px);
      color: white;
    }

    .btn-outline-light-custom {
      border: 2px solid var(--primary);
      color: var(--primary);
      background: transparent;
    }

    .btn-outline-light-custom:hover {
      background: var(--primary);
      color: white;
      border-color: var(--primary);
    }

    .btn-white-outline {
      border: 2px solid white;
      color: white;
      background: transparent;
    }

    .btn-white-outline:hover {
      background: white;
      color: var(--primary);
      border-color: white;
    }

    .container {
      max-width: 1200px;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 导航 */
    .navbar {
      background: white;
      border-bottom: 1px solid var(--border);
      padding: 0 16px;
      min-height: 70px;
      box-shadow: var(--shadow-sm);
    }

    .navbar-brand {
      font-size: 20px;
      font-weight: 700;
      color: var(--text-dark) !important;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .brand-icon {
      font-size: 28px;
      color: var(--primary);
    }

    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-body) !important;
      margin: 0 4px;
      padding: 8px 16px !important;
      position: relative;
      transition: 0.2s;
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease;
    }

    .nav-link:hover::after,
    .nav-link.active::after {
      width: 70%;
    }

    .nav-link:hover {
      color: var(--primary) !important;
    }

    .navbar .btn {
      padding: 10px 22px;
      font-size: 15px;
    }

    .search-icon {
      font-size: 20px;
      color: var(--text-body);
      cursor: pointer;
      margin-right: 16px;
    }

    .navbar-toggler {
      border: none;
      box-shadow: none;
    }

    /* Hero */
    .hero-section {
      background: linear-gradient(180deg, #F0F4FF 0%, var(--bg) 100%);
      padding: 80px 0 100px;
    }

    .hero-title {
      font-size: 48px;
      font-weight: 700;
      color: var(--text-dark);
    }

    .hero-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      margin: 24px 0 32px;
    }

    .hero-image {
      border-radius: 16px;
      box-shadow: 0 20px 35px rgba(0,0,0,0.1);
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    /* 亮点 */
    .highlight-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border);
      transition: all 0.25s ease;
    }

    .highlight-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }

    .highlight-number {
      font-size: 36px;
      font-weight: 700;
      color: var(--accent);
      font-family: var(--font-number);
    }

    /* 服务卡片 */
    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px 28px;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      height: 100%;
      display: flex;
      flex-direction: column;
    }

    .service-card:hover {
      box-shadow: var(--shadow-hover);
      border-color: var(--primary);
    }

    .service-icon {
      width: 64px;
      height: 64px;
      background: rgba(26,95,220,0.08);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 32px;
      color: var(--primary);
      margin-bottom: 24px;
      transition: 0.25s;
    }

    .service-card:hover .service-icon {
      background: linear-gradient(135deg, var(--primary), var(--primary-light));
      color: white;
    }

    .service-link {
      margin-top: auto;
      font-weight: 600;
      color: var(--primary);
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 方案对比 */
    .pricing-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px 24px;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      text-align: center;
      height: 100%;
    }

    .pricing-recommend {
      border: 2px solid var(--primary);
      position: relative;
      transform: scale(1.02);
    }

    .badge-recommend {
      background: var(--primary);
      color: white;
      border-radius: 20px;
      padding: 4px 16px;
      font-size: 14px;
    }

    /* 案例卡片 */
    .case-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: 0.3s;
      border: 1px solid var(--border);
    }

    .case-card:hover {
      box-shadow: var(--shadow-hover);
    }

    .case-img {
      width: 100%;
      height: 220px;
      object-fit: cover;
      transition: 0.4s;
    }

    .case-card:hover .case-img {
      transform: scale(1.05);
    }

    /* FAQ */
    .accordion-button {
      background: #F8FAFC;
      border-radius: var(--radius-btn) !important;
      padding: 18px 24px;
      font-weight: 600;
      color: var(--text-dark);
      box-shadow: none;
      border: 1px solid var(--border);
    }

    .accordion-button:not(.collapsed) {
      background: #EBF2FE;
      color: var(--primary);
      border-left: 3px solid var(--primary);
      box-shadow: none;
    }

    .accordion-item {
      border: none;
      margin-bottom: 12px;
      background: transparent;
    }

    /* CTA 通栏 */
    .cta-strip {
      background: linear-gradient(135deg, var(--primary), var(--primary-light));
      padding: 80px 0;
    }

    /* 页脚 */
    .footer {
      background: #0F172A;
      color: #CBD5E1;
      padding: 60px 0 30px;
    }

    .footer a {
      color: #CBD5E1;
      text-decoration: none;
    }

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

    .footer h5 {
      color: white;
      font-weight: 600;
      margin-bottom: 20px;
    }

    @media (max-width: 768px) {
      h1 { font-size: 32px; }
      h2 { font-size: 26px; }
      .hero-section { padding: 40px 0 60px; }
      .navbar-collapse { background: white; padding: 20px; border-radius: 12px; box-shadow: var(--shadow-hover); margin-top: 10px; }
    }