/* roulang page: index */
:root {
      --primary-900: #1A3B5C;
      --primary-700: #2B4F74;
      --primary-500: #3D638C;
      --accent-data: #0F7B8C;
      --accent-data-light: #E6F4F7;
      --cta-orange: #E87A2F;
      --cta-orange-dark: #C9651F;
      --bg-light: #F7F9FC;
      --bg-card: #FFFFFF;
      --bg-alt: #EDF2F7;
      --text-primary: #1A3B5C;
      --text-body: #4A5568;
      --text-muted: #718096;
      --text-footer: #CBD5E0;
      --border-light: #E2E8F0;
      --border-input: #CBD5E0;
      --shadow-card: 0 2px 12px rgba(26, 59, 92, 0.06);
      --shadow-card-hover: 0 8px 24px rgba(26, 59, 92, 0.12);
      --shadow-nav: 0 2px 10px rgba(0,0,0,0.04);
      --radius-md: 8px;
      --radius-btn: 6px;
      --radius-lg: 12px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      scroll-padding-top: 70px;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', 'Inter', sans-serif;
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 15px;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4 {
      color: var(--text-primary);
      font-weight: 600;
      line-height: 1.25;
    }
    h1 { font-size: 2.5rem; font-weight: 700; letter-spacing: -0.3px; }
    h2 { font-size: 2rem; margin-bottom: 0.75rem; display: flex; align-items: center; gap: 0.5rem; }
    h2::after {
      content: '';
      display: inline-block;
      width: 48px;
      height: 4px;
      background: var(--accent-data);
      border-radius: 2px;
      margin-left: 0.5rem;
      flex-shrink: 0;
    }
    h3 { font-size: 1.4rem; }
    a {
      color: var(--accent-data);
      text-decoration: none;
      transition: color 0.2s ease;
    }
    a:hover { color: var(--cta-orange); }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 2rem;
    }
    /* 导航栏 - 半透明固定 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0,0,0,0.04);
      z-index: 1000;
      transition: background 0.25s, box-shadow 0.25s;
    }
    .main-header.scrolled {
      background: #fff;
      box-shadow: var(--shadow-nav);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 68px;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 1.2rem;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--primary-900);
      letter-spacing: 0.5px;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--primary-900);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 1.2rem;
      font-weight: 700;
      position: relative;
    }
    .logo-icon::after {
      content: '';
      position: absolute;
      width: 8px;
      height: 8px;
      background: var(--accent-data);
      border-radius: 50%;
      bottom: -2px;
      right: -2px;
      border: 2px solid white;
    }
    .desktop-nav {
      display: flex;
      align-items: center;
      gap: 2.5rem;
      list-style: none;
    }
    .desktop-nav a {
      font-weight: 500;
      color: var(--text-body);
      font-size: 0.95rem;
      transition: color 0.2s;
      padding: 0.3rem 0;
      border-bottom: 2px solid transparent;
    }
    .desktop-nav a:hover,
    .desktop-nav a.active {
      color: var(--primary-900);
      border-bottom-color: var(--accent-data);
    }
    .nav-cta-btn {
      background: var(--cta-orange);
      color: white !important;
      padding: 0.5rem 1.8rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.9rem;
      border: none;
      transition: background 0.2s, box-shadow 0.2s;
      white-space: nowrap;
    }
    .nav-cta-btn:hover {
      background: var(--cta-orange-dark);
      box-shadow: inset 0 1px 4px rgba(0,0,0,0.1);
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--primary-900);
      cursor: pointer;
    }
    .mobile-nav {
      display: none;
      flex-direction: column;
      background: white;
      border-top: 1px solid var(--border-light);
      padding: 1.5rem 0;
    }
    .mobile-nav a {
      padding: 0.8rem 2rem;
      font-weight: 500;
      color: var(--text-body);
      border-left: 3px solid transparent;
    }
    .mobile-nav a:hover { background: var(--bg-light); color: var(--primary-900); }
    /* Hero 分屏 */
    .hero-section {
      display: flex;
      align-items: center;
      min-height: 92vh;
      padding-top: 90px;
      background: linear-gradient(105deg, #F7F9FC 0%, #EDF2F7 100%);
      gap: 2rem;
    }
    .hero-text {
      flex: 1.2;
      padding-right: 1rem;
    }
    .hero-title {
      font-size: 2.8rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.2rem;
    }
    .hero-subtitle {
      font-size: 1.25rem;
      color: var(--text-muted);
      margin-bottom: 1.8rem;
      max-width: 520px;
    }
    .hero-cta-group {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--cta-orange);
      color: white;
      padding: 0.8rem 2.2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: background 0.2s, box-shadow 0.2s;
      font-size: 1rem;
      display: inline-block;
    }
    .btn-primary:hover { background: var(--cta-orange-dark); box-shadow: inset 0 2px 6px rgba(0,0,0,0.08); }
    .btn-outline {
      border: 2px solid var(--primary-900);
      background: transparent;
      color: var(--primary-900);
      padding: 0.75rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: all 0.2s;
    }
    .btn-outline:hover { background: var(--primary-900); color: white; }
    .hero-dashboard {
      flex: 1;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1.2rem;
    }
    .stat-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 1.5rem;
      box-shadow: var(--shadow-card);
      text-align: center;
      border-left: 3px solid var(--accent-data);
    }
    .stat-number {
      font-family: 'Roboto Mono', monospace;
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--accent-data);
    }
    .stat-label {
      font-size: 0.85rem;
      color: var(--text-muted);
      margin-top: 0.2rem;
    }
    /* 通用区块 */
    section {
      padding: 5rem 0;
    }
    .bg-white { background: white; }
    .bg-alt { background: var(--bg-alt); }
    /* 核心优势 - 非对称卡片 */
    .features-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      gap: 1.8rem;
      margin-top: 2rem;
    }
    .feature-card {
      background: var(--bg-card);
      padding: 2rem;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    .feature-icon {
      font-size: 2rem;
      color: var(--accent-data);
      margin-bottom: 1rem;
    }
    .small-cards-stack {
      display: flex;
      flex-direction: column;
      gap: 1.2rem;
    }
    /* 服务矩阵 - 错落栅格 */
    .services-masonry {
      display: grid;
      grid-template-columns: 1fr 1.5fr 1fr;
      gap: 1.8rem;
      margin-top: 2rem;
    }
    .service-card {
      background: white;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: 0.25s;
      display: flex;
      flex-direction: column;
    }
    .service-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-card-hover); }
    .service-img {
      height: 160px;
      background-size: cover;
      background-position: center;
      background-color: var(--bg-alt);
    }
    .service-card .card-text {
      padding: 1.5rem;
    }
    /* 对比表格 */
    .comparison-table {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2rem;
      margin-top: 2rem;
    }
    .compare-col {
      background: white;
      padding: 2rem;
      border-radius: var(--radius-md);
    }
    .compare-col.better {
      border: 2px solid var(--accent-data);
      background: #F0F9FA;
    }
    .compare-row {
      display: flex;
      justify-content: space-between;
      padding: 0.6rem 0;
      border-bottom: 1px solid var(--border-light);
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 2rem auto 0;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      margin-bottom: 0.8rem;
    }
    .faq-question {
      display: flex;
      align-items: center;
      gap: 1rem;
      padding: 1.2rem 0.5rem;
      font-weight: 600;
      cursor: pointer;
      color: var(--text-primary);
      transition: 0.2s;
    }
    .faq-icon {
      width: 28px;
      height: 28px;
      background: var(--accent-data-light);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent-data);
      font-weight: 700;
      transition: 0.2s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s;
      background: #F7F9FC;
      border-radius: 6px;
      margin-left: 3rem;
      color: var(--text-body);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 1rem;
    }
    .faq-item.active .faq-icon {
      background: var(--accent-data);
      color: white;
    }
    /* CTA 表单 */
    .cta-wrapper {
      display: flex;
      gap: 3rem;
      align-items: center;
      flex-wrap: wrap;
      margin-top: 2rem;
    }
    .cta-form {
      flex: 1;
      background: white;
      padding: 2rem;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
    }
    .input-group {
      margin-bottom: 1.2rem;
    }
    input, textarea {
      width: 100%;
      border: 1px solid var(--border-input);
      border-radius: var(--radius-btn);
      padding: 0.8rem;
      font-family: inherit;
      transition: 0.2s;
      background: #fff;
    }
    input:focus, textarea:focus {
      outline: none;
      border-color: var(--accent-data);
      box-shadow: 0 0 0 3px rgba(15,123,140,0.15);
    }
    .btn-full { width: 100%; }
    /* 页脚 */
    .site-footer {
      background: var(--primary-900);
      color: var(--text-footer);
      padding: 3rem 0 1.5rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 2rem;
    }
    .footer-links a { display: block; color: var(--text-footer); margin-bottom: 0.4rem; }
    .copyright { border-top: 1px solid rgba(255,255,255,0.1); margin-top: 2rem; padding-top: 1.5rem; text-align: center; font-size: 0.85rem; }
    @media (max-width: 1024px) {
      .hero-dashboard { grid-template-columns: 1fr; }
      .services-masonry { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .desktop-nav { display: none; }
      .mobile-menu-btn { display: block; }
      .hero-section { flex-direction: column; text-align: center; }
      .hero-dashboard { width: 100%; }
      .features-grid, .comparison-table, .services-masonry, .footer-grid { grid-template-columns: 1fr; }
      .cta-wrapper { flex-direction: column; }
      h1 { font-size: 2rem; }
    }