/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    :root {
      --bg-deep: #0B0E14;
      --bg-card: rgba(15, 25, 45, 0.7);
      --electric-blue: #00C2FF;
      --neon-cyan: #00F0A8;
      --text-white: #FFFFFF;
      --text-light: #E0E6F0;
      --text-body: #B0B8C8;
      --text-muted: #6B7280;
      --border-dim: rgba(0, 194, 255, 0.15);
      --border-glow: rgba(0, 194, 255, 0.5);
      --shadow-card: 0 8px 32px rgba(0, 194, 255, 0.08);
      --shadow-hover: 0 12px 40px rgba(0, 194, 255, 0.25);
      --radius-lg: 16px;
      --radius-md: 12px;
      --font-sans: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --transition: 0.3s ease;
    }
    body {
      background-color: var(--bg-deep);
      color: var(--text-body);
      font-family: var(--font-sans);
      line-height: 1.7;
      font-size: 1rem;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    @media (max-width: 768px) {
      .container {
        padding-left: 16px;
        padding-right: 16px;
      }
    }
    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: rgba(11, 14, 20, 0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0, 194, 255, 0.15);
      transition: var(--transition);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--text-white);
      text-decoration: none;
      letter-spacing: -0.3px;
    }
    .logo i {
      color: var(--electric-blue);
      font-size: 2rem;
    }
    .logo span {
      color: var(--neon-cyan);
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .nav-link {
      color: var(--text-body);
      text-decoration: none;
      font-weight: 500;
      transition: color 0.2s;
      font-size: 0.95rem;
    }
    .nav-link:hover {
      color: var(--electric-blue);
    }
    .btn-primary {
      background: linear-gradient(135deg, #00C2FF, #0088CC);
      border: none;
      color: white;
      padding: 10px 22px;
      border-radius: var(--radius-md);
      font-weight: 600;
      font-size: 0.95rem;
      cursor: pointer;
      box-shadow: 0 0 20px rgba(0, 194, 255, 0.5);
      transition: all 0.3s ease;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      letter-spacing: 0.3px;
    }
    .btn-primary:hover {
      box-shadow: 0 0 30px rgba(0, 194, 255, 0.8);
      transform: scale(1.03);
      background: linear-gradient(135deg, #0ad0ff, #0099dd);
    }
    .btn-ghost {
      background: transparent;
      border: 1.5px solid var(--electric-blue);
      color: var(--electric-blue);
      padding: 10px 22px;
      border-radius: var(--radius-md);
      font-weight: 600;
      cursor: pointer;
      transition: all 0.3s ease;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-ghost:hover {
      background: rgba(0, 194, 255, 0.1);
      border-color: var(--neon-cyan);
      color: var(--neon-cyan);
    }
    .mobile-toggle {
      display: none;
      background: transparent;
      border: none;
      color: var(--text-white);
      font-size: 1.8rem;
      cursor: pointer;
    }
    @media (max-width: 1024px) {
      .nav-menu {
        gap: 20px;
      }
    }
    @media (max-width: 768px) {
      .mobile-toggle {
        display: block;
      }
      .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(8, 12, 18, 0.96);
        backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.4s ease;
        box-shadow: 0 10px 25px rgba(0,0,0,0.5);
      }
      .nav-menu.active {
        max-height: 500px;
        border-bottom: 1px solid var(--border-dim);
      }
      .nav-link {
        padding: 18px 24px;
        border-bottom: 1px solid rgba(255,255,255,0.05);
      }
      .header-cta {
        margin: 12px 24px 20px;
      }
    }
    /* Hero */
    .hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      margin-top: 70px;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(0,194,255,0.15) 0%, rgba(11,14,20,0.8) 80%);
      backdrop-filter: blur(3px);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 40px;
      width: 100%;
    }
    .hero-text {
      flex: 1;
    }
    .hero h1 {
      font-size: clamp(2.5rem, 5vw, 4rem);
      font-weight: 800;
      color: var(--text-white);
      line-height: 1.2;
      margin-bottom: 1.5rem;
      letter-spacing: -0.02em;
    }
    .hero h1 .highlight-blue {
      color: var(--electric-blue);
    }
    .hero h1 .highlight-cyan {
      color: var(--neon-cyan);
    }
    .hero h2 {
      font-size: clamp(1.2rem, 2.5vw, 1.5rem);
      color: var(--text-light);
      margin-bottom: 2rem;
      font-weight: 400;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-visual {
      flex: 1;
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .data-flow-box {
      width: 100%;
      max-width: 400px;
      aspect-ratio: 1/1;
      background: rgba(0,194,255,0.05);
      border: 1px solid var(--border-dim);
      border-radius: 24px;
      backdrop-filter: blur(10px);
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      overflow: hidden;
    }
    .data-flow-box i {
      font-size: 6rem;
      color: var(--electric-blue);
      opacity: 0.7;
    }
    @media (max-width: 768px) {
      .hero-content {
        flex-direction: column;
        text-align: center;
      }
      .hero-visual {
        order: -1;
      }
      .data-flow-box {
        max-width: 250px;
      }
    }
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 70px 0;
      }
    }
    .section-title {
      font-size: clamp(1.8rem, 3.5vw, 2.5rem);
      font-weight: 700;
      color: var(--text-light);
      margin-bottom: 0.5rem;
    }
    .section-sub {
      color: var(--text-muted);
      margin-bottom: 3rem;
    }
    /* 卡片通用 */
    .glass-card {
      background: var(--bg-card);
      backdrop-filter: blur(16px);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-dim);
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
    }
    .glass-card:hover {
      border-color: var(--border-glow);
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    /* 数据看板 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .stat-card {
      padding: 28px 20px;
      text-align: center;
    }
    .stat-icon {
      font-size: 2rem;
      color: var(--electric-blue);
      margin-bottom: 12px;
    }
    .stat-number {
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--neon-cyan);
      line-height: 1.2;
    }
    .stat-label {
      color: var(--text-muted);
      font-size: 0.9rem;
    }
    @media (max-width: 1024px) {
      .dashboard-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 520px) {
      .dashboard-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      overflow: hidden;
    }
    .service-img {
      height: 140px;
      background-size: cover;
      background-position: center;
      position: relative;
      transition: 0.3s;
    }
    .service-card:hover .service-img::after {
      background: rgba(0,194,255,0.3);
    }
    .service-img::after {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(0,0,0,0.3);
      transition: 0.3s;
    }
    .service-content {
      padding: 20px;
    }
    .service-content h3 {
      color: var(--electric-blue);
      font-size: 1.25rem;
      margin-bottom: 8px;
    }
    @media (max-width: 1024px) {
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 对比 */
    .comparison-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
    }
    .compare-card {
      padding: 30px;
      border-radius: var(--radius-lg);
    }
    .compare-left {
      background: rgba(100, 100, 110, 0.25);
      border: 1px solid rgba(255,255,255,0.1);
    }
    .compare-right {
      background: rgba(0,194,255,0.08);
      border: 1px solid var(--neon-cyan);
    }
    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin: 16px 0;
    }
    .strikethrough {
      text-decoration: line-through;
      color: #888;
    }
    @media (max-width: 768px) {
      .comparison-wrapper {
        grid-template-columns: 1fr;
      }
    }
    /* FAQ */
    .faq-item {
      background: rgba(255,255,255,0.02);
      border-bottom: 1px solid rgba(255,255,255,0.05);
      margin-bottom: 8px;
      border-radius: 8px;
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      color: white;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      padding: 0 24px 18px;
      color: var(--text-body);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    /* 表单 */
    .contact-form {
      max-width: 600px;
      margin: 0 auto;
      background: var(--bg-card);
      backdrop-filter: blur(16px);
      padding: 40px;
      border-radius: 24px;
      border: 1px solid var(--border-dim);
    }
    .input-field {
      width: 100%;
      padding: 14px;
      margin-bottom: 20px;
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(0,194,255,0.2);
      border-radius: 12px;
      color: white;
      font-size: 1rem;
    }
    .input-field:focus {
      border-color: var(--electric-blue);
      outline: none;
      box-shadow: 0 0 15px rgba(0,194,255,0.3);
    }
    footer {
      background: #080B10;
      padding: 50px 0 20px;
      color: var(--text-muted);
    }