/* roulang page: index */
:root {
      --primary-purple: #6C3CE0;
      --primary-cyan: #00D4FF;
      --accent-orange: #FF6B2B;
      --bg-deep: #0A0C14;
      --bg-card: #0F1119;
      --bg-elevated: #131620;
      --text-white: #FFFFFF;
      --text-light: #E0E0E0;
      --text-body: #B0B5C0;
      --text-muted: #6B7280;
      --border-dim: rgba(255,255,255,0.06);
      --border-hover: rgba(108,60,224,0.5);
      --radius-card: 16px;
      --radius-btn: 8px;
      --shadow-glow: 0 0 20px rgba(108,60,224,0.3);
      --shadow-orange: 0 0 20px rgba(255,107,43,0.4);
      --transition: 0.3s ease;
      --container-max: 1280px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      background-color: var(--bg-deep);
      color: var(--text-body);
      font-family: 'Noto Sans SC', 'Inter', system-ui, -apple-system, sans-serif;
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      transition: all var(--transition);
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      padding: 16px 0;
      transition: background var(--transition), backdrop-filter var(--transition), box-shadow var(--transition);
    }
    .header.scrolled {
      background: rgba(10, 12, 20, 0.85);
      backdrop-filter: blur(20px);
      box-shadow: 0 1px 0 var(--border-dim);
    }
    .nav-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      background: linear-gradient(135deg, var(--primary-purple), var(--primary-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo i {
      font-size: 28px;
      background: linear-gradient(135deg, var(--primary-purple), var(--primary-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      color: var(--text-body);
      font-weight: 500;
      position: relative;
      padding: 6px 0;
      font-size: 15px;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary-cyan);
      transition: width var(--transition);
    }
    .nav-links a:hover {
      color: var(--text-white);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .search-icon, .lang-icon {
      color: var(--text-body);
      font-size: 18px;
      transition: color var(--transition);
    }
    .search-icon:hover, .lang-icon:hover {
      color: var(--text-white);
    }
    .btn-primary {
      background: var(--accent-orange);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 4px 12px rgba(255,107,43,0.3);
      font-size: 15px;
    }
    .btn-primary:hover {
      background: #ff7f50;
      box-shadow: 0 0 24px rgba(255,107,43,0.6);
      transform: translateY(-1px);
    }
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      color: var(--text-white);
      font-size: 24px;
    }
    /* Hero */
    .hero {
      height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      background: radial-gradient(circle at 30% 40%, rgba(108,60,224,0.12) 0%, transparent 50%);
    }
    .hero-bg {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.35;
      z-index: 0;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
    }
    .hero h1 {
      font-size: clamp(40px, 6vw, 64px);
      font-weight: 700;
      line-height: 1.2;
      background: linear-gradient(to right, var(--primary-purple), var(--primary-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-body);
      margin-bottom: 40px;
      max-width: 600px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-ghost {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.4);
      color: var(--text-white);
      padding: 10px 28px;
      border-radius: var(--radius-btn);
      font-weight: 500;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .btn-ghost:hover {
      border-color: var(--primary-purple);
      background: rgba(108,60,224,0.1);
    }
    /* 板块通用 */
    .section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 36px;
      font-weight: 600;
      color: var(--text-white);
      margin-bottom: 16px;
    }
    .section-desc {
      color: var(--text-body);
      margin-bottom: 48px;
      max-width: 700px;
    }
    /* 不对称网格 */
    .asym-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      gap: 24px;
    }
    .glass-card {
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(20px);
      border: 1px solid var(--border-dim);
      border-radius: var(--radius-card);
      padding: 32px;
      transition: all var(--transition);
    }
    .glass-card:hover {
      border-color: var(--border-hover);
      transform: translateY(-4px);
      box-shadow: var(--shadow-glow);
    }
    .icon-purple {
      color: var(--primary-purple);
      font-size: 32px;
      margin-bottom: 20px;
    }
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .data-strip {
      background: var(--bg-elevated);
      border-radius: var(--radius-card);
      padding: 48px 24px;
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      text-align: center;
    }
    .data-item h3 {
      font-size: 40px;
      font-weight: 700;
      background: linear-gradient(135deg, var(--primary-purple), var(--primary-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .case-slider {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scroll-snap-type: x mandatory;
    }
    .case-card {
      min-width: 300px;
      background: var(--bg-card);
      border-radius: var(--radius-card);
      overflow: hidden;
      border: 1px solid var(--border-dim);
      scroll-snap-align: start;
    }
    .case-card img {
      aspect-ratio: 16/9;
      object-fit: cover;
    }
    .steps {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-dim);
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 500;
      font-size: 18px;
      color: var(--text-white);
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .cta-block {
      background: radial-gradient(circle at center, rgba(108,60,224,0.2), transparent);
      text-align: center;
      padding: 80px 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 1024px) {
      .service-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .nav-links, .nav-actions .btn-primary { display: none; }
      .mobile-toggle { display: block; }
      .asym-grid { grid-template-columns: 1fr; }
      .service-grid { grid-template-columns: 1fr; }
      .steps { flex-direction: column; gap: 24px; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero h1 { font-size: 36px; }
    }