/* roulang page: index */
:root {
      --primary: #1A3A5C;
      --primary-deep: #0F2942;
      --accent: #C8A951;
      --accent-deep: #A88E3E;
      --bg: #FAFBFD;
      --card-bg: #FFFFFF;
      --text-dark: #1E293B;
      --text-mid: #64748B;
      --border-light: #E2E8F0;
      --success: #059669;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 4px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 6px 24px rgba(26,58,92,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Inter", system-ui, -apple-system, sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-dark);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(6px);
      border-bottom: 1px solid var(--border-light);
      z-index: 50;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 32px;
      transition: background 0.2s;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary);
      text-decoration: none;
    }
    .logo-icon {
      color: var(--accent);
      font-size: 1.8rem;
      line-height: 1;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
    }
    .nav-links a {
      text-decoration: none;
      color: var(--text-dark);
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .btn-nav {
      background: var(--accent);
      color: #1E293B !important;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      transition: background 0.2s, transform 0.2s;
    }
    .btn-nav:hover {
      background: var(--accent-deep);
      transform: translateY(-2px);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      width: 26px;
      height: 3px;
      background: var(--primary);
      border-radius: 4px;
      transition: 0.2s;
    }
    /* 移动端导航 */
    @media (max-width: 1024px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        box-shadow: 0 12px 24px rgba(0,0,0,0.05);
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: flex;
      }
    }
    /* 板块间距 */
    section {
      padding: 120px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 80px 0;
      }
      .header {
        padding: 0 20px;
      }
    }
    h2 {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
      line-height: 1.3;
    }
    .section-sub {
      color: var(--text-mid);
      font-size: 18px;
      margin-bottom: 48px;
    }
    /* 按钮系统 */
    .btn {
      display: inline-block;
      font-weight: 600;
      border-radius: var(--radius-btn);
      text-decoration: none;
      transition: all 0.25s ease;
      cursor: pointer;
      border: none;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border: 2px solid var(--primary);
    }
    .btn-primary:hover {
      background: var(--primary-deep);
      border-color: var(--primary-deep);
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(26,58,92,0.18);
    }
    .btn-outline {
      background: transparent;
      color: var(--primary);
      border: 2px solid var(--primary);
      padding: 14px 32px;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    .btn-gold {
      background: var(--accent);
      color: #1E293B;
      padding: 16px 40px;
      font-weight: 700;
      border: none;
    }
    .btn-gold:hover {
      background: var(--accent-deep);
      transform: translateY(-2px);
      box-shadow: 0 10px 20px rgba(200,169,81,0.3);
    }
    /* Hero */
    .hero-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.9fr;
      gap: 60px;
      align-items: center;
    }
    .hero-title {
      font-size: 48px;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 20px;
      color: var(--primary);
    }
    .hero-desc {
      font-size: 18px;
      color: var(--text-mid);
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-image img {
      width: 100%;
      border-radius: 16px;
      box-shadow: 0 20px 35px rgba(0,0,0,0.08);
    }
    /* 服务卡片 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .service-card {
      background: var(--card-bg);
      padding: 32px;
      border-radius: var(--radius-card);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: var(--primary);
    }
    .icon-gold {
      color: var(--accent);
      font-size: 42px;
      margin-bottom: 20px;
    }
    .service-card h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .link-arrow {
      color: var(--accent);
      font-weight: 600;
      text-decoration: none;
      display: inline-block;
      margin-top: 16px;
    }
    /* 数据块 */
    .stats-block {
      background: #F1F5F9;
      border-radius: 16px;
      padding: 48px 32px;
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      text-align: center;
    }
    .stat-number {
      font-size: 42px;
      font-weight: 800;
      color: var(--accent);
    }
    /* 案例 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      border: 1px solid var(--border-light);
      display: flex;
      flex-direction: column;
      transition: 0.3s;
    }
    .case-card:hover {
      box-shadow: var(--shadow-hover);
    }
    .case-img img {
      width: 100%;
      height: 240px;
      object-fit: cover;
      transition: transform 0.3s;
    }
    .case-card:hover .case-img img {
      transform: scale(1.03);
    }
    .case-content {
      padding: 24px;
    }
    .tag {
      background: #eef4ff;
      color: var(--primary);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 500;
    }
    /* 流程 */
    .process-flow {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      position: relative;
    }
    .step {
      text-align: center;
      flex: 1;
    }
    .circle {
      width: 48px;
      height: 48px;
      background: var(--accent);
      color: #1E293B;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 20px;
      margin: 0 auto 12px;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      width: 100%;
      background: none;
      border: none;
      padding: 20px 8px;
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--text-dark);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-mid);
      padding: 0 8px;
    }
    .faq-answer.open {
      max-height: 200px;
      padding-bottom: 16px;
    }
    /* CTA */
    .cta-band {
      background: var(--primary);
      color: white;
      text-align: center;
      border-radius: 20px;
      padding: 64px 32px;
    }
    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      padding: 60px 0;
    }
    @media (max-width: 1024px) {
      .hero-grid, .cards-grid, .cases-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
      .stats-block {
        grid-template-columns: repeat(2, 1fr);
      }
      .process-flow {
        flex-direction: column;
        gap: 24px;
      }
    }
    @media (max-width: 768px) {
      .hero-title { font-size: 32px; }
      h2 { font-size: 28px; }
      .btn { padding: 12px 24px; width: 100%; text-align: center; }
    }