/* roulang page: index */
:root {
      --primary: #6C0BFF;
      --primary-hover: #7D2FFF;
      --secondary: #00F2E7;
      --accent: #FF3D71;
      --bg-deep: #0A0B14;
      --bg-card: #13152B;
      --bg-card-light: #1A1D3A;
      --text-primary: #FFFFFF;
      --text-secondary: #B4B8D6;
      --text-muted: #7A7FAA;
      --border-color: rgba(108, 11, 255, 0.18);
      --border-glow: rgba(0, 242, 231, 0.45);
      --radius-xl: 24px;
      --radius-lg: 16px;
      --radius-md: 10px;
      --radius-sm: 6px;
      --shadow-card: 0 4px 24px rgba(108, 11, 255, 0.12);
      --shadow-hover: 0 12px 32px rgba(0, 242, 231, 0.28);
      --transition: 0.25s ease-in-out;
      --container-width: 1280px;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: 'Segoe UI', 'Noto Sans SC', system-ui, -apple-system, 'Helvetica Neue', sans-serif;
      background-color: var(--bg-deep);
      color: var(--text-secondary);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

    h1, h2, h3, h4 {
      color: var(--text-primary);
      font-weight: 700;
      letter-spacing: -0.3px;
    }

    h1 {
      font-size: 3rem;
      line-height: 1.2;
      font-weight: 900;
    }

    h2 {
      font-size: 2.25rem;
      line-height: 1.3;
      margin-bottom: 1rem;
    }

    h3 {
      font-size: 1.25rem;
      line-height: 1.4;
      font-weight: 600;
    }

    a {
      color: var(--secondary);
      text-decoration: none;
      transition: color var(--transition);
    }

    a:hover {
      color: var(--primary-hover);
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    .container {
      max-width: var(--container-width);
      margin: 0 auto;
      padding: 0 1.5rem;
      width: 100%;
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(10, 11, 20, 0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid transparent;
      transition: border-color 0.2s, background 0.2s;
      z-index: 999;
      display: flex;
      align-items: center;
    }

    .navbar.scrolled {
      border-bottom: 1px solid rgba(108, 11, 255, 0.3);
      background: rgba(10, 11, 20, 0.95);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--container-width);
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    .logo {
      font-size: 1.7rem;
      font-weight: 900;
      letter-spacing: 1px;
      color: white;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .logo i {
      color: var(--secondary);
      font-size: 2rem;
    }

    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }

    .nav-links a {
      color: var(--text-secondary);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 0.25rem 0;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: white;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--secondary);
      transition: width 0.2s;
    }

    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 0.7rem 1.8rem;
      border-radius: var(--radius-md);
      font-weight: 600;
      cursor: pointer;
      transition: background 0.2s, box-shadow 0.2s;
      font-size: 0.95rem;
      display: inline-flex;
      align-items: center;
      gap: 0.3rem;
    }

    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: 0 0 20px rgba(108, 11, 255, 0.65);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--secondary);
      color: var(--secondary);
      padding: 0.7rem 1.8rem;
      border-radius: var(--radius-md);
      font-weight: 600;
      cursor: pointer;
      transition: all 0.2s;
    }

    .btn-outline:hover {
      background: rgba(0, 242, 231, 0.1);
      border-color: var(--secondary);
      box-shadow: 0 0 16px rgba(0,242,231,0.5);
    }

    /* 移动端导航 */
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: rgba(10, 11, 20, 0.9);
      backdrop-filter: blur(20px);
      border-top: 1px solid rgba(108,11,255,0.3);
      padding: 0.6rem 1rem;
      justify-content: space-around;
      z-index: 1000;
    }

    .mobile-nav a {
      color: var(--text-muted);
      font-size: 0.7rem;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 0.2rem;
    }
    .mobile-nav a i { font-size: 1.2rem; }
    .mobile-nav a.active { color: var(--secondary); }

    /* Hero */
    .hero {
      padding: 140px 0 80px;
      display: flex;
      align-items: center;
      min-height: 90vh;
      position: relative;
      overflow: hidden;
    }

    .hero-content {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }

    .hero-text h1 {
      background: linear-gradient(135deg, #fff 0%, #e0d4ff 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .hero-sub {
      font-size: 1.1rem;
      color: var(--text-secondary);
      margin: 1.5rem 0 2rem;
    }

    .badge-group {
      display: flex;
      gap: 1rem;
      margin-top: 1.8rem;
      flex-wrap: wrap;
    }

    .badge {
      background: rgba(0, 242, 231, 0.1);
      color: var(--secondary);
      padding: 0.4rem 1rem;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 500;
      display: flex;
      align-items: center;
      gap: 0.3rem;
      border: 1px solid rgba(0,242,231,0.25);
    }

    .hero-visual {
      background: radial-gradient(circle at 30% 30%, rgba(108,11,255,0.3), transparent 70%);
      border-radius: var(--radius-xl);
      display: flex;
      justify-content: center;
      align-items: center;
      min-height: 380px;
    }

    /* 通用区块 */
    section {
      padding: 100px 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 3rem;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.8rem;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.8rem;
    }

    .card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 2rem 1.5rem;
      transition: all var(--transition);
      position: relative;
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: var(--border-glow);
    }
    .feature-icon {
      font-size: 2.4rem;
      color: var(--secondary);
      margin-bottom: 1.2rem;
    }
    .data-badge {
      background: rgba(0,242,231,0.12);
      color: var(--secondary);
      padding: 0.25rem 0.8rem;
      border-radius: 20px;
      font-size: 0.75rem;
      font-weight: 600;
      display: inline-block;
      margin-top: 1rem;
    }

    .scenario-card {
      background: linear-gradient(145deg, #13152B 0%, #1A1D3A 100%);
    }
    .scenario-number {
      font-size: 3rem;
      font-weight: 900;
      color: rgba(255,255,255,0.05);
      position: absolute;
      top: 10px;
      right: 20px;
    }

    .cases-scroll {
      display: flex;
      gap: 1.5rem;
      overflow-x: auto;
      padding-bottom: 1rem;
      scroll-snap-type: x mandatory;
    }
    .case-card {
      flex: 0 0 280px;
      background: var(--bg-card-light);
      border-radius: var(--radius-lg);
      padding: 1.5rem;
      border: 1px solid var(--border-color);
      scroll-snap-align: start;
    }
    .big-number {
      font-size: 2.5rem;
      font-weight: 800;
      background: linear-gradient(135deg, var(--secondary), var(--primary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin: 0.5rem 0;
    }

    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.8rem;
    }
    .pricing-card {
      background: var(--bg-card);
      border-radius: var(--radius-xl);
      padding: 2.5rem 2rem;
      border: 1px solid var(--border-color);
    }
    .pricing-card.featured {
      background: linear-gradient(145deg, #1E1B3A, #13152B);
      border-color: var(--primary);
      transform: scale(1.02);
      box-shadow: 0 8px 30px rgba(108,11,255,0.25);
    }

    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1.5rem;
    }
    .faq-item {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      padding: 1.2rem;
      cursor: pointer;
      border-left: 3px solid transparent;
    }
    .faq-item.active {
      border-left-color: var(--primary);
      background: #1A1D3A;
    }

    .cta-banner {
      background: linear-gradient(135deg, #6C0BFF 0%, #00F2E7 100%);
      border-radius: var(--radius-xl);
      padding: 4rem 2rem;
      text-align: center;
    }

    footer {
      background: #0A0B14;
      padding: 4rem 0 2rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }

    @media (max-width: 1024px) {
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .hero-content { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-nav { display: flex; }
      .navbar { height: 60px; }
      section { padding: 60px 0; }
      h1 { font-size: 2.2rem; }
      .grid-3, .pricing-grid, .faq-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero { padding: 100px 0 40px; }
    }