/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    :root {
      --deep-blue: #0A0E27;
      --cyan: #00F0FF;
      --orange: #FF6B35;
      --card-bg: rgba(13, 20, 45, 0.7);
      --glass-border: rgba(0, 240, 255, 0.15);
      --text-primary: #FFFFFF;
      --text-secondary: #B0C4DE;
      --radius: 16px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --glow-cyan: 0 0 20px rgba(0, 240, 255, 0.5);
      --transition: 0.25s ease;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--deep-blue);
      color: var(--text-primary);
      line-height: 1.7;
      background-image: 
        linear-gradient(rgba(0, 240, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 240, 255, 0.03) 1px, transparent 1px);
      background-size: 40px 40px;
      overflow-x: hidden;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 PC */
    .navbar {
      position: sticky;
      top: 0;
      z-index: 100;
      backdrop-filter: blur(16px);
      background: rgba(10, 14, 39, 0.8);
      border-bottom: 1px solid var(--glass-border);
      transition: background 0.3s;
    }
    .navbar .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      letter-spacing: 1px;
      color: var(--cyan);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo span {
      color: white;
      font-weight: 400;
    }
    .nav-links {
      display: flex;
      gap: 32px;
    }
    .nav-links a {
      color: var(--text-secondary);
      text-decoration: none;
      font-size: 14px;
      font-weight: 500;
      position: relative;
      padding: 6px 0;
      transition: color 0.2s;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--cyan);
      transition: width 0.25s ease;
    }
    .nav-links a:hover {
      color: var(--cyan);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      background: rgba(10, 14, 39, 0.9);
      backdrop-filter: blur(20px);
      border-top: 1px solid var(--glass-border);
      padding: 12px 16px;
      justify-content: space-around;
      z-index: 101;
    }
    .mobile-nav a {
      color: var(--text-secondary);
      font-size: 12px;
      text-decoration: none;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 4px;
      transition: color 0.2s;
    }
    .mobile-nav a i {
      font-size: 20px;
    }
    .mobile-nav a.active, .mobile-nav a:hover {
      color: var(--cyan);
    }
    /* Hero */
    #hero {
      padding: 80px 0 60px;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
    }
    .hero-text {
      flex: 1;
    }
    .hero-text h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
      color: white;
    }
    .hero-text h1 span {
      color: var(--cyan);
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 500px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--orange);
      border: none;
      padding: 14px 32px;
      border-radius: 40px;
      font-weight: 600;
      font-size: 16px;
      color: white;
      cursor: pointer;
      box-shadow: 0 0 20px rgba(255, 107, 53, 0.6);
      transition: var(--transition);
      text-decoration: none;
      display: inline-block;
    }
    .btn-primary:hover {
      background: #e85d2b;
      box-shadow: 0 0 30px rgba(255, 107, 53, 0.9);
      transform: scale(1.03);
    }
    .btn-outline {
      border: 1px solid var(--cyan);
      background: transparent;
      padding: 14px 32px;
      border-radius: 40px;
      font-weight: 600;
      font-size: 16px;
      color: var(--cyan);
      cursor: pointer;
      transition: var(--transition);
      text-decoration: none;
    }
    .btn-outline:hover {
      background: rgba(0, 240, 255, 0.1);
      border-color: white;
      color: white;
    }
    .hero-image {
      flex: 1;
      display: flex;
      justify-content: center;
    }
    .hero-image img {
      max-width: 100%;
      height: auto;
      border-radius: 24px;
      box-shadow: 0 25px 50px -12px rgba(0,0,0,0.6);
    }
    /* 指标看板 */
    #metrics {
      padding: 40px 0 70px;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .metric-card {
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius);
      padding: 28px 16px;
      text-align: center;
      box-shadow: var(--shadow-card);
    }
    .metric-number {
      font-size: 42px;
      font-weight: 800;
      color: var(--cyan);
      text-shadow: 0 0 12px rgba(0,240,255,0.5);
      display: block;
      margin-bottom: 8px;
    }
    .metric-label {
      font-size: 15px;
      color: var(--text-secondary);
      font-weight: 500;
    }
    /* 服务矩阵 2x3 */
    #services {
      padding: 70px 0;
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
      color: white;
    }
    .section-desc {
      color: var(--text-secondary);
      margin-bottom: 48px;
      font-size: 17px;
    }
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      transition: transform 0.2s, border-color 0.2s;
    }
    .service-card:hover {
      transform: translateY(-6px);
      border-color: var(--cyan);
    }
    .service-icon {
      width: 80px;
      height: 80px;
      background: rgba(0,240,255,0.08);
      border-radius: 20px;
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .service-icon img {
      width: 48px;
      height: 48px;
      object-fit: contain;
    }
    .service-card h3 {
      font-size: 20px;
      margin-bottom: 10px;
      font-weight: 600;
    }
    .service-card p {
      color: var(--text-secondary);
      font-size: 15px;
      margin-bottom: 18px;
      line-height: 1.6;
    }
    .text-link {
      color: var(--cyan);
      text-decoration: none;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      transition: gap 0.2s;
    }
    .text-link:hover {
      gap: 8px;
    }
    /* 对比卡片 */
    #compare {
      padding: 70px 0;
    }
    .compare-wrapper {
      display: flex;
      gap: 24px;
      align-items: stretch;
    }
    .compare-card {
      flex: 1;
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      border-radius: var(--radius);
      padding: 32px;
      border: 1px solid var(--glass-border);
    }
    .compare-card.dark-red {
      background: rgba(80, 20, 30, 0.25);
      border-color: rgba(255, 80, 80, 0.3);
    }
    .compare-card.cyan-glow {
      border-color: var(--cyan);
      background: rgba(0, 240, 255, 0.05);
    }
    .compare-title {
      font-size: 24px;
      font-weight: 700;
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .compare-list {
      list-style: none;
    }
    .compare-list li {
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 10px;
      color: var(--text-secondary);
    }
    .vs-badge {
      background: var(--orange);
      color: white;
      font-weight: 800;
      padding: 8px 16px;
      border-radius: 30px;
      align-self: center;
      font-size: 18px;
      box-shadow: 0 0 15px rgba(255,107,53,0.5);
    }
    /* FAQ */
    #faq {
      padding: 70px 0;
    }
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--glass-border);
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 18px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: white;
      transition: color 0.2s;
    }
    .faq-question:hover {
      color: var(--cyan);
    }
    .faq-icon {
      font-size: 24px;
      font-weight: 300;
      transition: transform 0.3s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.2s;
      color: var(--text-secondary);
      padding-right: 20px;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }
    .faq-item.open .faq-icon {
      transform: rotate(45deg);
    }
    /* CTA 表单 */
    #cta {
      padding: 80px 0;
    }
    .cta-grid {
      display: flex;
      gap: 48px;
      background: var(--card-bg);
      backdrop-filter: blur(16px);
      border-radius: 24px;
      padding: 48px;
      border: 1px solid var(--glass-border);
    }
    .cta-left h2 {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .cta-left p {
      color: var(--text-secondary);
      font-size: 17px;
    }
    .cta-right {
      flex: 1;
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-group input {
      width: 100%;
      padding: 14px 20px;
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(0,240,255,0.2);
      border-radius: 30px;
      color: white;
      font-size: 16px;
      outline: none;
      transition: 0.2s;
    }
    .form-group input:focus {
      border-color: var(--cyan);
      box-shadow: 0 0 12px rgba(0,240,255,0.4);
    }
    .btn-submit {
      width: 100%;
      background: var(--orange);
      border: none;
      padding: 14px;
      border-radius: 30px;
      font-weight: 700;
      color: white;
      font-size: 16px;
      cursor: pointer;
      transition: var(--transition);
    }
    .btn-submit:hover {
      background: #e85d2b;
      box-shadow: 0 0 25px rgba(255,107,53,0.7);
    }
    /* 页脚 */
    #footer {
      padding: 48px 0 24px;
      border-top: 1px solid var(--glass-border);
      text-align: center;
    }
    .footer-logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--cyan);
      margin-bottom: 12px;
    }
    .footer-desc {
      color: var(--text-secondary);
      margin-bottom: 24px;
    }
    .footer-links {
      display: flex;
      justify-content: center;
      gap: 32px;
      margin-bottom: 32px;
    }
    .footer-links a {
      color: var(--text-secondary);
      text-decoration: none;
      font-size: 14px;
    }
    .copyright {
      color: #5a6a8c;
      font-size: 13px;
    }
    @media (max-width: 1024px) {
      .hero-grid {
        flex-direction: column;
      }
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .navbar .nav-links {
        display: none;
      }
      .mobile-nav {
        display: flex;
      }
      .hero-text h1 {
        font-size: 32px;
      }
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .services-grid {
        grid-template-columns: 1fr;
      }
      .compare-wrapper {
        flex-direction: column;
      }
      .cta-grid {
        flex-direction: column;
        padding: 32px;
      }
      .section-title {
        font-size: 28px;
      }
    }