/* roulang page: index */
:root {
      --primary: #2A3B6B;
      --primary-light: rgba(42,59,107,0.08);
      --green: #00A86B;
      --orange: #FF8C00;
      --silver: #AAB2C0;
      --text: #1E2330;
      --text-secondary: #6B7280;
      --bg: #F4F6FA;
      --card-bg: #FFFFFF;
      --border: #E8ECF1;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.02);
      --shadow-card: 0 1px 3px rgba(0,0,0,0.02), 0 4px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 6px 16px rgba(42,59,107,0.12);
      --radius-sm: 4px;
      --radius: 8px;
      --radius-card: 12px;
      --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      --transition: 200ms ease-out;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    img {
      max-width: 100%;
      display: block;
      height: auto;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
    }
    h1, h2, h3 {
      font-weight: 600;
    }
    h1 {
      font-size: 44px;
      line-height: 1.2;
      font-weight: 700;
    }
    h2 {
      font-size: 32px;
      line-height: 1.3;
    }
    h3 {
      font-size: 20px;
      line-height: 1.4;
    }
    .section {
      padding: 90px 0;
    }
    .text-secondary {
      color: var(--text-secondary);
      font-size: 16px;
    }
    .tag {
      display: inline-block;
      background: #F0F2F8;
      color: var(--text-secondary);
      font-size: 12px;
      font-weight: 500;
      padding: 4px 10px;
      border-radius: var(--radius-sm);
      letter-spacing: 0.3px;
    }
    /* 导航 */
    .header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border);
      height: 64px;
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-weight: 700;
      font-size: 20px;
      color: var(--primary);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo svg {
      width: 28px;
      height: 28px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      font-size: 15px;
      font-weight: 500;
    }
    .nav-links a {
      position: relative;
      padding: 4px 0;
      transition: color var(--transition);
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 10px 24px;
      border-radius: var(--radius);
      font-weight: 600;
      font-size: 15px;
      transition: all var(--transition);
      box-shadow: 0 2px 6px rgba(42,59,107,0.15);
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: #1e2d52;
      box-shadow: var(--shadow-hover);
      transform: translateY(-1px);
    }
    .btn-outline-light {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 12px 32px;
      border-radius: var(--radius);
      font-weight: 600;
      transition: all var(--transition);
      display: inline-block;
    }
    .btn-outline-light:hover {
      background: white;
      color: var(--primary);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 4px;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--text);
      display: block;
      transition: var(--transition);
    }
    .mobile-menu {
      display: none;
      position: absolute;
      top: 64px;
      left: 0;
      width: 100%;
      background: white;
      border-bottom: 1px solid var(--border);
      flex-direction: column;
      padding: 20px 24px;
      gap: 20px;
    }
    .mobile-menu a {
      font-size: 18px;
      font-weight: 500;
    }
    /* Hero */
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .hero-text {
      flex: 1;
      padding: 42px 32px;
    }
    .hero-text h1 {
      margin-bottom: 16px;
      color: var(--text);
    }
    .hero-text p {
      color: var(--text-secondary);
      margin-bottom: 28px;
      max-width: 480px;
    }
    .hero-image {
      flex: 1;
      background: #E8ECF1;
      min-height: 360px;
      position: relative;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
    }
    .star-dots {
      position: absolute;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 20% 30%, rgba(170,178,192,0.15) 1px, transparent 1px);
      background-size: 30px 30px;
    }
    /* 卡片通用 */
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 28px 24px;
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
      border: 1px solid var(--border);
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .service-icon {
      width: 44px;
      height: 44px;
      background: #F0F2F8;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-right: 16px;
      color: var(--primary);
    }
    .service-row {
      display: flex;
      align-items: flex-start;
    }
    .stat-number {
      font-size: 32px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 6px;
    }
    .case-img {
      height: 180px;
      background: #E8ECF1;
      border-radius: 8px 8px 0 0;
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .case-tag {
      position: absolute;
      top: 12px;
      left: 12px;
      background: rgba(0,0,0,0.6);
      color: white;
      font-size: 12px;
      padding: 4px 10px;
      border-radius: 4px;
    }
    .faq-item {
      background: white;
      border-radius: var(--radius-card);
      margin-bottom: 12px;
      border: 1px solid var(--border);
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-size: 18px;
      background: white;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.25s ease;
      background: #FAFBFC;
      padding: 0 24px;
      color: var(--text-secondary);
    }
    .faq-answer.open {
      max-height: 200px;
      padding: 16px 24px;
    }
    .cta-block {
      background: var(--primary);
      border-radius: var(--radius-card);
      padding: 64px 32px;
      text-align: center;
      color: white;
    }
    .footer {
      background: #1E2330;
      color: #AAB2C0;
      padding: 48px 0 24px;
    }
    .footer-grid {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 32px;
    }
    @media (max-width: 1024px) {
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      h1 { font-size: 32px; }
      h2 { font-size: 24px; }
      .section { padding: 64px 0; }
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-grid { flex-direction: column; }
      .hero-image { min-height: 260px; width: 100%; }
      .grid-3, .grid-4 { grid-template-columns: 1fr; }
      .container { padding: 0 16px; }
    }
    @media (max-width: 480px) {
      .hero-text { padding: 28px 20px; }
    }