/* roulang page: index */
:root {
      --primary: #0B5E8A;
      --primary-hover: #094C70;
      --accent: #F97316;
      --accent-hover: #EA580C;
      --bg-page: #F8FAFC;
      --bg-card: #FFFFFF;
      --bg-footer: #0F172A;
      --bg-faq: #F1F5F9;
      --text-main: #1E293B;
      --text-secondary: #64748B;
      --text-on-dark: #CBD5E1;
      --border-light: #E2E8F0;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
      --shadow-hover: 0 10px 25px rgba(11,94,138,0.12), 0 4px 10px rgba(0,0,0,0.06);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-pill: 20px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", system-ui, -apple-system, sans-serif;
      --font-number: "Inter", "Segoe UI", system-ui, sans-serif;
      --transition: 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, .btn {
      font-family: inherit;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: var(--transition);
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 双层导航 */
    .navbar {
      position: sticky;
      top: 0;
      z-index: 50;
      background: #FFFFFF;
      box-shadow: 0 1px 4px rgba(0,0,0,0.04);
    }
    .nav-row1 {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 56px;
    }
    .logo {
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 6px;
      letter-spacing: 0.5px;
    }
    .logo-icon {
      font-size: 1.8rem;
      line-height: 1;
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .search-icon {
      font-size: 1.3rem;
      color: var(--text-secondary);
      background: none;
      border: none;
      cursor: default;
    }
    .btn-primary {
      background: var(--primary);
      color: #fff;
      border: none;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.95rem;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
    }
    .btn-accent {
      background: var(--accent);
      color: #fff;
      border: none;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 1rem;
    }
    .btn-accent:hover {
      background: var(--accent-hover);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 10px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }
    .btn-outline:hover {
      background: rgba(11,94,138,0.06);
    }
    .nav-row2 {
      background: var(--bg-page);
      height: 48px;
      display: flex;
      align-items: center;
      overflow-x: auto;
      white-space: nowrap;
      scrollbar-width: none;
      -ms-overflow-style: none;
      position: relative;
      border-top: 1px solid var(--border-light);
    }
    .nav-row2::-webkit-scrollbar {
      display: none;
    }
    .nav-tabs {
      display: flex;
      gap: 8px;
      padding: 0 8px;
      align-items: center;
    }
    .nav-pill {
      background: transparent;
      color: var(--text-secondary);
      padding: 8px 18px;
      border-radius: var(--radius-pill);
      font-weight: 500;
      font-size: 0.9rem;
      transition: var(--transition);
      display: inline-block;
      border: none;
    }
    .nav-pill:hover {
      background: #E0F2FE;
      color: var(--primary);
    }
    .nav-pill.active {
      background: var(--primary);
      color: #fff;
    }
    .fade-mask {
      position: absolute;
      right: 0;
      top: 0;
      bottom: 0;
      width: 40px;
      background: linear-gradient(to left, var(--bg-page), transparent);
      pointer-events: none;
    }
    /* Hero */
    .hero {
      background: linear-gradient(135deg, #F8FAFC 0%, #EFF6FF 100%);
      display: flex;
      align-items: center;
      gap: 40px;
      padding: 60px 0;
      min-height: 480px;
    }
    .hero-text {
      flex: 1 1 50%;
    }
    .hero h1 {
      font-size: 2.75rem;
      font-weight: 700;
      line-height: 1.2;
      color: var(--text-main);
      margin-bottom: 16px;
    }
    .hero .subtitle {
      font-size: 1.4rem;
      font-weight: 500;
      color: var(--primary);
      margin-bottom: 20px;
    }
    .hero .desc {
      font-size: 1.125rem;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-image {
      flex: 1 1 50%;
      position: relative;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: var(--shadow-hover);
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 320px;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(11,94,138,0.1) 0%, rgba(255,255,255,0.05) 100%);
    }
    /* 通用区块 */
    section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      text-align: center;
      margin-bottom: 16px;
    }
    .section-subtitle {
      text-align: center;
      color: var(--text-secondary);
      font-size: 1.1rem;
      margin-bottom: 48px;
    }
    /* 卡片网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .card {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      padding: 28px 24px;
      transition: var(--transition);
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .feature-icon {
      width: 48px;
      height: 48px;
      background: rgba(11,94,138,0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      font-size: 1.5rem;
    }
    .card h3 {
      font-size: 1.35rem;
      font-weight: 600;
      margin-bottom: 12px;
    }
    /* 场景交替 */
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 64px;
    }
    .scenario-row.reverse {
      flex-direction: row-reverse;
    }
    .scenario-img {
      flex: 1 1 45%;
      border-radius: 20px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      background: #e9eef2;
    }
    .scenario-img img {
      width: 100%;
      height: auto;
      object-fit: cover;
      aspect-ratio: 4/3;
    }
    .scenario-content {
      flex: 1 1 50%;
    }
    .scenario-content h3 {
      font-size: 1.5rem;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .text-link {
      color: var(--primary);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
    /* 案例卡片 */
    .case-card img {
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
      border-radius: 8px 8px 0 0;
    }
    .case-body {
      padding: 20px;
    }
    .tag {
      background: #E0F2FE;
      color: var(--primary);
      padding: 2px 10px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
    }
    /* 价格卡片 */
    .pricing-card {
      position: relative;
      background: var(--bg-card);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      border: 1px solid var(--border-light);
      transition: var(--transition);
    }
    .pricing-card.featured {
      border-top: 4px solid var(--primary);
      background: #F8FAFE;
      box-shadow: var(--shadow-hover);
    }
    .price {
      font-family: var(--font-number);
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--primary);
      margin: 16px 0;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      background: #fff;
      width: 100%;
      text-align: left;
      padding: 18px 20px;
      font-weight: 600;
      font-size: 1.1rem;
      border: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      background: var(--bg-faq);
      padding: 0 20px;
      max-height: 0;
      overflow: hidden;
      transition: 0.3s ease;
      border-left: 4px solid var(--primary);
      margin-left: 0;
    }
    .faq-answer.open {
      padding: 18px 20px;
      max-height: 300px;
    }
    /* CTA 横幅 */
    .cta-banner {
      background: var(--primary);
      color: #fff;
      text-align: center;
      padding: 64px 24px;
      border-radius: 24px;
      margin: 0 24px;
    }
    /* 页脚 */
    .footer {
      background: var(--bg-footer);
      color: var(--text-on-dark);
      padding: 60px 0 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    .footer a:hover {
      color: #fff;
    }
    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2,1fr); }
      .hero { flex-direction: column; }
      .hero-image { min-height: 260px; width: 100%; }
    }
    @media (max-width: 768px) {
      h1 { font-size: 2rem; }
      .section-title { font-size: 1.6rem; }
      .grid-3 { grid-template-columns: 1fr; }
      .scenario-row, .scenario-row.reverse { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .nav-row2 { -webkit-overflow-scrolling: touch; }
    }