/* roulang page: index */
:root {
      --primary-deep: #0A0E27;
      --accent-purple: #6C5CE7;
      --cta-cyan: #00D2FF;
      --glass-bg: rgba(255, 255, 255, 0.04);
      --glass-border: rgba(108, 92, 231, 0.25);
      --text-primary: #E8E8F0;
      --text-secondary: #8B8FA8;
      --highlight-gold: #FFD93D;
      --card-bg: rgba(255, 255, 255, 0.03);
      --card-hover-bg: rgba(255, 255, 255, 0.06);
      --divider: rgba(255, 255, 255, 0.06);
      --radius-card: 20px;
      --radius-button: 50px;
      --shadow-glow: 0 0 30px rgba(0, 210, 255, 0.5), 0 0 60px rgba(0, 210, 255, 0.2);
      --shadow-hover: 0 20px 40px rgba(0, 210, 255, 0.12);
      --transition-smooth: all 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      background-color: var(--primary-deep);
      color: var(--text-primary);
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Inter', 'SF Pro Display', sans-serif;
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10, 14, 39, 0.8);
      backdrop-filter: blur(30px);
      -webkit-backdrop-filter: blur(30px);
      border-bottom: 1px solid transparent;
      background-image: linear-gradient(rgba(10,14,39,0.8), rgba(10,14,39,0.8)), linear-gradient(to right, #6C5CE7, transparent);
      background-origin: border-box;
      background-clip: padding-box, border-box;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 22px;
      font-weight: 800;
      letter-spacing: 0.5px;
      color: #fff;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: linear-gradient(135deg, #6C5CE7, #00D2FF);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      font-weight: 800;
      color: #0A0E27;
    }
    .nav-menu {
      display: flex;
      gap: 40px;
      align-items: center;
    }
    .nav-link {
      color: var(--text-secondary);
      font-weight: 500;
      font-size: 16px;
      transition: color 0.3s;
      position: relative;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--cta-cyan);
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--cta-cyan);
      box-shadow: 0 0 8px var(--cta-cyan);
    }
    .header-cta {
      background: var(--cta-cyan);
      color: var(--primary-deep);
      padding: 10px 24px;
      border-radius: var(--radius-button);
      font-weight: 600;
      letter-spacing: 0.5px;
      box-shadow: 0 0 15px rgba(0,210,255,0.4);
      border: none;
    }
    .header-cta:hover {
      box-shadow: 0 0 30px rgba(0,210,255,0.7);
      transform: scale(1.03);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
      background: none;
      border: none;
        padding: 8px;
    }
    .hamburger span {
      display: block;
      width: 26px;
      height: 2px;
      background: #fff;
      transition: 0.3s;
      border-radius: 2px;
    }
    /* 移动导航面板 */
    .mobile-panel {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(10, 14, 39, 0.97);
      backdrop-filter: blur(30px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      z-index: 999;
      transform: translateX(100%);
      transition: transform 0.4s ease;
    }
    .mobile-panel.open {
      transform: translateX(0);
    }
    .mobile-panel .nav-link {
      font-size: 22px;
    }
    .close-panel {
      position: absolute;
      top: 24px;
      right: 24px;
      background: none;
      border: none;
      color: #fff;
      font-size: 28px;
    }
    /* Hero */
    .hero {
      padding: 140px 0 80px;
      background: radial-gradient(circle at 80% 20%, rgba(108,92,231,0.15) 0%, transparent 60%);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 52px;
      font-weight: 700;
      letter-spacing: -1px;
      line-height: 1.2;
      margin-bottom: 24px;
      color: #fff;
    }
    .hero-subtitle {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 80%;
    }
    .hero-stats {
      display: flex;
      gap: 32px;
      margin-bottom: 40px;
      flex-wrap: wrap;
    }
    .stat-item {
      display: flex;
      flex-direction: column;
    }
    .stat-number {
      font-family: 'Inter', sans-serif;
      font-size: 36px;
      font-weight: 800;
      color: var(--highlight-gold);
    }
    .stat-label {
      font-size: 14px;
      color: var(--text-secondary);
    }
    .cta-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--cta-cyan);
      color: #0A0E27;
      font-weight: 600;
      letter-spacing: 1px;
      padding: 14px 36px;
      border-radius: 50px;
      border: none;
      box-shadow: var(--shadow-glow);
      transition: var(--transition-smooth);
      font-size: 16px;
    }
    .btn-primary:hover {
      box-shadow: 0 0 50px rgba(0,210,255,0.7);
      transform: scale(1.05);
    }
    .btn-secondary {
      background: transparent;
      border: 1px solid rgba(108,92,231,0.5);
      color: #E8E8F0;
      font-weight: 600;
      padding: 14px 36px;
      border-radius: 50px;
      transition: var(--transition-smooth);
    }
    .btn-secondary:hover {
      border-color: var(--cta-cyan);
      color: var(--cta-cyan);
    }
    .hero-image img {
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
      border: 1px solid rgba(108,92,231,0.3);
    }
    /* 通用板块 */
    .section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      letter-spacing: -0.5px;
      margin-bottom: 16px;
      text-align: center;
      color: #fff;
    }
    .section-sub {
      color: var(--text-secondary);
      text-align: center;
      margin-bottom: 60px;
      font-size: 18px;
    }
    /* 卡片玻璃 */
    .glass-card {
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(24px) saturate(180%);
      -webkit-backdrop-filter: blur(24px) saturate(180%);
      border: 1px solid rgba(108,92,231,0.2);
      border-radius: 20px;
      box-shadow: inset 0 1px 0 rgba(255,255,255,0.05);
      transition: var(--transition-smooth);
    }
    .glass-card:hover {
      border-color: rgba(0,210,255,0.5);
      background: rgba(255,255,255,0.06);
      transform: translateY(-4px);
      box-shadow: 0 20px 40px rgba(0,210,255,0.12);
    }
    /* 优势网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
    }
    .feature-card {
      padding: 32px 24px;
      text-align: center;
    }
    .feature-icon {
      width: 56px;
      height: 56px;
      margin: 0 auto 20px;
      color: var(--cta-cyan);
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .feature-card h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .feature-card p {
      color: var(--text-secondary);
      font-size: 15px;
    }
    /* 产品矩阵 2x3 */
    .product-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .product-card {
      overflow: hidden;
    }
    .product-card img {
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
      border-radius: 20px 20px 0 0;
    }
    .product-content {
      padding: 24px;
    }
    .product-content h3 {
      font-size: 22px;
      margin-bottom: 16px;
    }
    .feature-list {
      list-style: none;
      margin-bottom: 20px;
    }
    .feature-list li {
      display: flex;
      align-items: center;
      gap: 10px;
      color: var(--text-secondary);
      margin-bottom: 8px;
      font-size: 15px;
    }
    .feature-list li::before {
      content: '';
      width: 8px;
      height: 8px;
      background: var(--highlight-gold);
      border-radius: 50%;
      display: inline-block;
    }
    .ghost-link {
      color: var(--cta-cyan);
      font-weight: 500;
      border-bottom: 1px solid transparent;
      transition: 0.3s;
    }
    .ghost-link:hover {
      border-bottom: 1px solid var(--cta-cyan);
    }
    /* 场景交替 */
    .scene-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      margin-bottom: 80px;
    }
    .scene-row.reverse {
      direction: rtl;
    }
    .scene-row.reverse .scene-text {
      direction: ltr;
    }
    .scene-img img {
      border-radius: 24px;
      border: 1px solid rgba(108,92,231,0.4);
    }
    .scene-text h3 {
      font-size: 30px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .data-highlight {
      font-family: 'Inter', sans-serif;
      font-size: 40px;
      font-weight: 800;
      color: var(--highlight-gold);
      margin-top: 16px;
    }
    /* 案例 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .case-card {
      padding: 32px;
      text-align: center;
    }
    .case-number {
      font-size: 48px;
      font-weight: 800;
      color: var(--highlight-gold);
      font-family: 'Inter', sans-serif;
    }
    .testimonial {
      font-style: italic;
      color: var(--text-secondary);
      margin: 16px 0;
    }
    .case-tag {
      font-size: 14px;
      color: var(--accent-purple);
      border-top: 1px solid var(--divider);
      padding-top: 12px;
      margin-top: 12px;
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--divider);
      cursor: pointer;
      padding: 18px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 18px;
      font-weight: 600;
      position: relative;
      padding-left: 16px;
    }
    .faq-question::before {
      content: '';
      position: absolute;
      left: 0;
      top: 4px;
      bottom: 4px;
      width: 3px;
      background: var(--cta-cyan);
      border-radius: 2px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-secondary);
      background: rgba(255,255,255,0.02);
      border-radius: 8px;
      margin-top: 8px;
      padding: 0 16px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px;
    }
    .arrow {
      transition: transform 0.3s;
    }
    .faq-item.active .arrow {
      transform: rotate(180deg);
    }
    /* 终极CTA */
    .cta-section {
      background: #060B1F;
      padding: 100px 0;
      text-align: center;
    }
    .cta-title {
      font-size: 38px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .trust-text {
      color: var(--text-secondary);
      margin-top: 20px;
      font-size: 14px;
    }
    /* 页脚 */
    .footer {
      background: #0A0E27;
      padding: 60px 0 30px;
      border-top: 1px solid var(--divider);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer-col h4 {
      margin-bottom: 16px;
      color: #fff;
    }
    .footer-col ul {
      list-style: none;
    }
    .footer-col li {
      margin-bottom: 10px;
      color: var(--text-secondary);
    }
    .copyright {
      text-align: center;
      margin-top: 40px;
      color: var(--text-secondary);
      font-size: 14px;
    }
    /* 响应式 */
    @media (max-width: 1024px) {
      .hero-grid, .features-grid, .product-grid, .case-grid, .scene-row {
        grid-template-columns: 1fr;
        gap: 32px;
      }
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .hero h1 { font-size: 40px; }
    }
    @media (max-width: 768px) {
      .hero { padding: 120px 0 60px; }
      .hero h1 { font-size: 32px; }
      .container { padding: 0 16px; }
      .section { padding: 80px 0; }
      .footer-grid { grid-template-columns: 1fr; }
    }