/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    :root {
      --primary: #0A0E27;
      --secondary: #00E5A0;
      --accent: #FF4D2E;
      --bg-light: #F5F7FA;
      --card-bg: #FFFFFF;
      --text-dark: #1A1F3A;
      --text-body: #4A4A5A;
      --text-light: #8A8FA1;
      --border-light: rgba(255,255,255,0.12);
      --shadow-card: 0 8px 28px rgba(10,14,39,0.06);
      --shadow-hover: 0 18px 36px rgba(10,14,39,0.12);
      --radius-lg: 20px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --radius-full: 50px;
      --font-heading: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --font-number: 'Inter', 'Noto Sans SC', sans-serif;
      --transition: all 0.3s ease;
    }
    body {
      font-family: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      color: var(--text-dark);
    }
    h1 {
      font-size: 56px;
      font-weight: 900;
      letter-spacing: -0.5px;
      line-height: 1.2;
    }
    h2 {
      font-size: 40px;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 16px;
    }
    h3 {
      font-size: 22px;
      font-weight: 600;
      line-height: 1.4;
    }
    .section {
      padding: 100px 0;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      display: block;
      border-radius: var(--radius-sm);
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-heading);
      font-weight: 700;
      transition: var(--transition);
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    /* 导航 */
    #nav {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
      transition: background 0.3s;
    }
    #nav.scrolled {
      background: #0A0E27;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      font-size: 24px;
      font-weight: 900;
      color: white;
      letter-spacing: 1px;
      font-family: var(--font-heading);
      background: linear-gradient(135deg, #FFFFFF 0%, #00E5A0 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      color: rgba(255,255,255,0.9);
      font-weight: 500;
      position: relative;
      padding: 6px 0;
      transition: color 0.2s;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      width: 0;
      height: 2px;
      background: var(--secondary);
      transition: width 0.3s ease, left 0.3s ease;
    }
    .nav-links a:hover {
      color: var(--secondary);
    }
    .nav-links a:hover::after {
      width: 100%;
      left: 0;
    }
    .btn-nav {
      background: var(--secondary);
      color: #0A0E27 !important;
      padding: 10px 22px;
      border-radius: var(--radius-full);
      font-weight: 700;
      margin-left: 12px;
      box-shadow: 0 4px 12px rgba(0,229,160,0.3);
    }
    .btn-nav:hover {
      background: #00FFB3;
      box-shadow: 0 8px 20px rgba(0,229,160,0.5);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 26px;
      height: 2px;
      background: white;
      border-radius: 2px;
      transition: 0.3s;
    }
    /* Hero */
    #hero {
      background: linear-gradient(135deg, #0A0E27 0%, #1A1F3A 100%);
      padding: 0;
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      align-items: center;
      min-height: 90vh;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
      gap: 40px;
    }
    .hero-left h1 {
      color: white;
      margin-bottom: 20px;
    }
    .hero-left .subtitle {
      font-size: 18px;
      color: rgba(255,255,255,0.8);
      margin-bottom: 36px;
      max-width: 90%;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--secondary);
      color: #0A0E27;
      padding: 16px 40px;
      border-radius: var(--radius-full);
      font-weight: 700;
      box-shadow: 0 8px 24px rgba(0,229,160,0.4);
    }
    .btn-primary:hover {
      background: #00FFB3;
      box-shadow: 0 12px 32px rgba(0,229,160,0.6);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--secondary);
      color: var(--secondary);
      padding: 16px 40px;
      border-radius: var(--radius-full);
      font-weight: 700;
    }
    .btn-outline:hover {
      background: var(--secondary);
      color: #0A0E27;
    }
    .data-card-glass {
      background: rgba(255,255,255,0.07);
      border: 1px solid rgba(255,255,255,0.15);
      backdrop-filter: blur(20px);
      border-radius: var(--radius-lg);
      padding: 28px;
      display: flex;
      flex-direction: column;
      gap: 20px;
      color: white;
    }
    .stat-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .stat-label {
      color: rgba(255,255,255,0.7);
    }
    .stat-value {
      font-family: var(--font-number);
      font-weight: 700;
      font-size: 32px;
      color: var(--secondary);
    }
    /* 数据看板 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 32px;
    }
    .metric-card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-card);
      text-align: center;
    }
    .metric-number {
      font-family: var(--font-number);
      font-size: 48px;
      font-weight: 700;
      color: var(--accent);
    }
    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 32px;
    }
    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      overflow: hidden;
      transition: var(--transition);
      border-top: 4px solid var(--secondary);
      padding: 32px;
    }
    .service-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
      border-color: var(--accent);
    }
    /* 对比区 */
    .comparison-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      background: white;
      border-radius: var(--radius-lg);
      padding: 24px;
    }
    /* 案例横向滚动 */
    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scrollbar-width: thin;
    }
    .case-card {
      flex: 0 0 300px;
      background: white;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      padding: 20px;
    }
    /* FAQ */
    .faq-item {
      background: white;
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
    }
    .faq-question {
      padding: 20px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    /* CTA */
    .cta-dark {
      background: #0A0E27;
      border-radius: var(--radius-lg);
      padding: 60px;
    }
    .btn-accent {
      background: var(--accent);
      color: white;
      border-radius: var(--radius-full);
      padding: 16px 40px;
    }
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; text-align: center; }
      .dashboard-grid, .services-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 767px) {
      h1 { font-size: 36px; }
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .dashboard-grid, .services-grid { grid-template-columns: 1fr; }
      .comparison-wrapper { grid-template-columns: 1fr; }
    }