/* roulang page: index */
:root {
      --deep-space: #0B0C1E;
      --nebula-cyan: #00F0FF;
      --electric-purple: #A855F7;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(0, 240, 255, 0.15);
      --text-primary: #E2E8F0;
      --text-secondary: #94A3B8;
      --text-dim: #CBD5E1;
      --card-glow: 0 8px 32px rgba(0, 0, 0, 0.4);
      --hover-glow: 0 0 20px rgba(0, 240, 255, 0.3);
      --button-glow: 0 0 20px rgba(0, 240, 255, 0.5);
      --button-hover-glow: 0 0 35px rgba(168, 85, 247, 0.7);
      --radius-xl: 20px;
      --radius-lg: 12px;
      --radius-pill: 50px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --container-max: 1280px;
      --section-gap: 120px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      background-color: var(--deep-space);
    }
    body {
      font-family: var(--font-sans);
      background: radial-gradient(circle at 30% 20%, #1a1c3a 0%, #0B0C1E 80%);
      color: var(--text-primary);
      line-height: 1.7;
      min-height: 100vh;
      position: relative;
      overflow-x: hidden;
    }
    body::before {
      content: "";
      position: fixed;
      inset: 0;
      background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 400 400"><circle cx="20" cy="30" r="0.8" fill="white" opacity="0.2"/><circle cx="150" cy="80" r="0.6" fill="white" opacity="0.15"/><circle cx="300" cy="220" r="0.9" fill="white" opacity="0.2"/><circle cx="350" cy="70" r="0.5" fill="white" opacity="0.1"/><circle cx="80" cy="350" r="0.7" fill="white" opacity="0.25"/><circle cx="250" cy="300" r="0.4" fill="white" opacity="0.2"/></svg>');
      background-size: 200px 200px;
      pointer-events: none;
      z-index: 0;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
      position: relative;
      z-index: 2;
    }
    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(11, 12, 30, 0.8);
      backdrop-filter: blur(30px);
      -webkit-backdrop-filter: blur(30px);
      border-bottom: 1px solid rgba(0, 240, 255, 0.2);
      z-index: 50;
      display: flex;
      align-items: center;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
      color: var(--nebula-cyan);
      font-weight: 700;
      font-size: 1.5rem;
      letter-spacing: 1px;
    }
    .logo-icon {
      width: 28px;
      height: 28px;
      border: 2px solid var(--nebula-cyan);
      border-radius: 50%;
      position: relative;
      background: transparent;
      box-shadow: 0 0 10px rgba(0,240,255,0.5);
    }
    .logo-icon::after {
      content: "";
      position: absolute;
      top: 3px;
      left: 3px;
      width: 18px;
      height: 18px;
      border: 1px dashed var(--nebula-cyan);
      border-radius: 50%;
      animation: spin 12s linear infinite;
    }
    @keyframes spin { to { transform: rotate(360deg); } }
    .nav-links {
      display: flex;
      gap: 42px;
      list-style: none;
    }
    .nav-links a {
      color: var(--text-secondary);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s;
      position: relative;
      padding-bottom: 6px;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--nebula-cyan);
    }
    .nav-links a.active::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--nebula-cyan);
      box-shadow: 0 0 6px var(--nebula-cyan);
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .search-placeholder {
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(0,240,255,0.2);
      border-radius: var(--radius-pill);
      padding: 8px 16px;
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--text-secondary);
      font-size: 0.85rem;
      width: 200px;
    }
    .search-placeholder i {
      color: var(--nebula-cyan);
      opacity: 0.7;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--nebula-cyan), var(--electric-purple));
      border: none;
      color: #0B0C1E;
      font-weight: 700;
      padding: 10px 24px;
      border-radius: var(--radius-pill);
      cursor: pointer;
      box-shadow: var(--button-glow);
      transition: all 0.3s ease;
      text-decoration: none;
      display: inline-block;
    }
    .btn-primary:hover {
      box-shadow: var(--button-hover-glow);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--nebula-cyan);
      color: var(--nebula-cyan);
      padding: 10px 24px;
      border-radius: var(--radius-pill);
      font-weight: 500;
      transition: all 0.3s;
      text-decoration: none;
      display: inline-block;
    }
    .btn-outline:hover {
      background: rgba(0,240,255,0.1);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--nebula-cyan);
    }
    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-links, .header-actions .search-placeholder {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .mobile-menu {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(11,12,30,0.95);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 24px;
        gap: 16px;
        display: none;
        z-index: 40;
      }
      .mobile-menu.active {
        display: flex;
      }
      .mobile-menu a {
        color: var(--text-primary);
        font-size: 1.1rem;
      }
    }
    section {
      padding: var(--section-gap) 0;
    }
    h2 {
      font-size: 2rem;
      font-weight: 600;
      margin-bottom: 16px;
      color: var(--text-primary);
    }
    .section-subtitle {
      color: var(--text-secondary);
      margin-bottom: 48px;
    }
    /* Hero */
    .hero {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      min-height: 85vh;
      padding-top: 120px;
    }
    .hero h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      color: white;
      text-shadow: 0 0 15px rgba(0,240,255,0.4);
      margin-bottom: 24px;
    }
    .hero p {
      font-size: 1.2rem;
      color: var(--text-dim);
      margin-bottom: 32px;
    }
    .hero-visual {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: var(--radius-xl);
      height: 380px;
      box-shadow: 0 0 40px rgba(168,85,247,0.3);
      border: 1px solid rgba(0,240,255,0.2);
    }
    /* 功能卡片网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 28px;
    }
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-xl);
      padding: 32px;
      box-shadow: var(--card-glow);
      transition: all 0.3s ease;
    }
    .glass-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--hover-glow), 0 0 30px rgba(168,85,247,0.3);
    }
    .feature-icon {
      font-size: 2.4rem;
      color: var(--nebula-cyan);
      margin-bottom: 20px;
    }
    .glass-card h3 {
      font-size: 1.4rem;
      color: var(--nebula-cyan);
      margin-bottom: 12px;
    }
    /* 场景图文交错 */
    .scenario-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      margin-bottom: 80px;
    }
    .scenario-img {
      background-size: cover;
      background-position: center;
      min-height: 320px;
      border-radius: var(--radius-xl);
      border: 1px solid rgba(168,85,247,0.3);
    }
    /* 案例卡片 */
    .stats-row {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 32px;
      margin-bottom: 48px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--nebula-cyan);
      font-feature-settings: "tnum";
    }
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 24px;
    }
    .case-card {
      border-left: 4px solid var(--electric-purple);
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(0,240,255,0.15);
      padding: 18px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: rgba(0,240,255,0.02);
      padding-left: 12px;
      color: var(--text-dim);
      margin-top: 8px;
    }
    .faq-item.active .faq-answer {
      max-height: 150px;
    }
    /* CTA 横幅 */
    .cta-banner {
      background: radial-gradient(circle at center, rgba(168,85,247,0.2) 0%, transparent 70%);
      text-align: center;
      padding: 80px 0;
    }
    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      padding: 60px 0 40px;
    }
    .footer-col p { color: var(--text-secondary); }
    .footer-col a { color: var(--text-secondary); text-decoration: none; display: block; margin-bottom: 8px; }
    .footer-col a:hover { color: var(--nebula-cyan); }
    .social-icons i { font-size: 1.5rem; margin-right: 12px; color: var(--text-secondary); }
    @media (max-width: 1024px) {
      .hero { grid-template-columns: 1fr; }
      .scenario-row { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr 1fr; }
      h1 { font-size: 2.4rem; }
    }