/* roulang page: index */
:root {
      --primary: #0EA5E9;
      --primary-dark: #0284C7;
      --accent: #F97316;
      --accent-dark: #EA580C;
      --white: #FFFFFF;
      --gray-bg: #F8FAFC;
      --gray-border: #E2E8F0;
      --text-dark: #1E293B;
      --text-secondary: #64748B;
      --success: #10B981;
      --danger: #EF4444;
      --radius: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
      --shadow-hover: 0 10px 25px rgba(0,0,0,0.08), 0 4px 10px rgba(0,0,0,0.05);
      --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-stack);
      background-color: var(--white);
      color: var(--text-dark);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, input {
      font-family: inherit;
    }
    /* 导航 */
    .header {
      position: sticky;
      top: 0;
      background: var(--white);
      border-bottom: 1px solid var(--gray-border);
      z-index: 50;
      height: 64px;
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--text-dark);
      white-space: nowrap;
    }
    .logo span {
      color: var(--primary);
    }
    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }
    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-secondary);
      transition: color 0.2s;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: background 0.2s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: background 0.2s, color 0.2s;
    }
    .btn-outline:hover {
      background: rgba(14, 165, 233, 0.05);
    }
    .btn-accent {
      background: var(--accent);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: background 0.2s;
    }
    .btn-accent:hover {
      background: var(--accent-dark);
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.6rem;
      color: var(--text-dark);
      cursor: pointer;
    }
    /* 移动端导航 */
    .mobile-menu {
      display: none;
      position: fixed;
      top: 64px;
      left: 0;
      width: 100%;
      background: white;
      border-bottom: 1px solid var(--gray-border);
      padding: 20px 24px;
      flex-direction: column;
      gap: 16px;
      z-index: 40;
    }
    .mobile-menu.active {
      display: flex;
    }
    .mobile-menu a {
      font-size: 1.1rem;
      font-weight: 500;
      color: var(--text-dark);
      padding: 8px 0;
      border-bottom: 1px solid var(--gray-border);
    }
    .mobile-menu .btn-primary {
      width: 100%;
      margin-top: 8px;
    }
    /* Hero */
    .hero {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 60px 0 50px;
      background: var(--white);
      position: relative;
      overflow: hidden;
    }
    .hero-content {
      flex: 1 1 50%;
      padding-right: 30px;
    }
    .hero-title {
      font-size: 38px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--text-dark);
      margin-bottom: 16px;
    }
    .hero-sub {
      font-size: 1.1rem;
      color: var(--text-secondary);
      margin-bottom: 28px;
      line-height: 1.6;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 32px;
    }
    .hero-visual {
      flex: 1 1 45%;
      background: linear-gradient(135deg, rgba(14,165,233,0.08) 0%, rgba(249,115,22,0.05) 100%);
      border-radius: 24px;
      min-height: 280px;
      display: flex;
      align-items: center;
      justify-content: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      overflow: hidden;
    }
    .hero-visual::after {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(255,255,255,0.1);
    }
    .data-strip {
      display: flex;
      gap: 32px;
      flex-wrap: wrap;
    }
    .data-item {
      display: flex;
      flex-direction: column;
    }
    .data-number {
      font-size: 28px;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.2;
    }
    .data-label {
      font-size: 14px;
      color: var(--text-secondary);
    }
    /* 板块通用 */
    section {
      padding: 70px 0;
    }
    .section-title {
      font-size: 28px;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 12px;
      text-align: center;
    }
    .section-subtitle {
      color: var(--text-secondary);
      text-align: center;
      max-width: 600px;
      margin: 0 auto 40px;
      font-size: 1rem;
    }
    /* 数据看板 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .stat-card {
      background: var(--gray-bg);
      border-radius: var(--radius);
      padding: 24px;
      text-align: center;
      border: none;
    }
    .stat-number {
      font-size: 36px;
      font-weight: 700;
      color: var(--accent);
      margin-bottom: 6px;
    }
    .stat-label {
      color: var(--text-secondary);
      font-size: 14px;
    }
    .trend-up {
      color: var(--success);
      margin-left: 6px;
    }
    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--white);
      border: 1px solid var(--gray-border);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-card);
      transition: box-shadow 0.25s ease, transform 0.2s;
    }
    .service-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-3px);
    }
    .icon-circle {
      width: 56px;
      height: 56px;
      background: rgba(14,165,233,0.1);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 26px;
      margin-bottom: 18px;
    }
    .service-card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 10px;
    }
    .service-card p {
      color: var(--text-secondary);
      font-size: 15px;
      margin-bottom: 16px;
    }
    .text-link {
      color: var(--primary);
      font-weight: 500;
      font-size: 14px;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
    /* 对比区 */
    .compare-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
      margin-top: 30px;
    }
    .compare-box {
      padding: 28px;
      border-radius: var(--radius);
    }
    .compare-left {
      background: #FEF2F2;
      border: 1px solid #FECACA;
    }
    .compare-right {
      background: #F0FDF4;
      border: 1px solid #BBF7D0;
    }
    .compare-box h3 {
      font-size: 22px;
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .compare-list {
      list-style: none;
    }
    .compare-list li {
      display: flex;
      align-items: flex-start;
      gap: 10px;
      margin-bottom: 14px;
      color: var(--text-dark);
    }
    .icon-red {
      color: var(--danger);
    }
    .icon-green {
      color: var(--success);
    }
    /* FAQ */
    .faq-group {
      margin-bottom: 32px;
    }
    .faq-group h3 {
      font-size: 20px;
      font-weight: 600;
      color: var(--text-dark);
      margin-bottom: 16px;
      padding-bottom: 6px;
      border-bottom: 1px solid var(--gray-border);
    }
    .accordion {
      border: 1px solid var(--gray-border);
      border-radius: var(--radius);
      margin-bottom: 12px;
      background: white;
    }
    .accordion-question {
      width: 100%;
      background: none;
      border: none;
      padding: 18px 20px;
      font-size: 16px;
      font-weight: 600;
      text-align: left;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--text-dark);
    }
    .accordion-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #F0F9FF;
      padding: 0 20px;
      color: var(--text-secondary);
      font-size: 15px;
      line-height: 1.7;
    }
    .accordion-answer.open {
      max-height: 200px;
      padding: 16px 20px;
    }
    /* 表单 */
    .cta-section {
      background: var(--gray-bg);
      text-align: center;
    }
    .form-card {
      max-width: 480px;
      margin: 0 auto;
      background: white;
      padding: 32px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-card);
    }
    .input-field {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid #CBD5E1;
      border-radius: var(--radius-btn);
      margin-bottom: 16px;
      font-size: 15px;
      transition: border 0.2s;
    }
    .input-field:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(14,165,233,0.15);
    }
    .trust-badges {
      display: flex;
      justify-content: center;
      gap: 24px;
      margin-top: 16px;
      color: var(--text-secondary);
      font-size: 13px;
      flex-wrap: wrap;
    }
    /* 页脚 */
    .footer {
      background: #1E293B;
      color: #CBD5E1;
      padding: 48px 0 28px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
      margin-bottom: 32px;
    }
    .footer-logo {
      font-size: 1.5rem;
      font-weight: 700;
      color: white;
      margin-bottom: 12px;
    }
    .footer a {
      color: #CBD5E1;
      font-size: 14px;
      display: block;
      margin-bottom: 8px;
    }
    .footer a:hover {
      color: white;
    }
    .footer-bottom {
      border-top: 1px solid #334155;
      padding-top: 20px;
      text-align: center;
      font-size: 13px;
    }
    /* 响应式 */
    @media (max-width: 1024px) {
      .dashboard-grid { grid-template-columns: repeat(2,1fr); }
      .services-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .hero { flex-direction: column; padding: 40px 0; }
      .hero-content { padding-right: 0; text-align: center; }
      .hero-buttons { justify-content: center; }
      .hero-visual { width: 100%; min-height: 220px; margin-top: 30px; }
      .compare-row { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .dashboard-grid { grid-template-columns: 1fr; }
      .services-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 520px) {
      .hero-title { font-size: 28px; }
      .data-strip { gap: 20px; }
    }