/* roulang page: index */
:root {
      --primary: #7C3AED;
      --primary-glow: rgba(124, 58, 237, 0.45);
      --accent: #06D6A0;
      --accent-glow: rgba(6, 214, 160, 0.35);
      --cta: #F59E0B;
      --cta-glow: rgba(245, 158, 11, 0.45);
      --bg-deep: #0F0A1A;
      --bg-card: rgba(255, 255, 255, 0.04);
      --border-card: rgba(255, 255, 255, 0.08);
      --text-primary: #FFFFFF;
      --text-secondary: #B8B5C7;
      --text-muted: #7A7593;
      --radius-xl: 1rem;
      --radius-2xl: 1.25rem;
      --shadow-card: 0 12px 30px -8px rgba(0,0,0,0.6), 0 0 0 1px rgba(124,58,237,0.2);
      --shadow-glow: 0 0 20px rgba(124,58,237,0.4);
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      background-color: var(--bg-deep);
      color: var(--text-secondary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      background-image: radial-gradient(ellipse at 50% 0%, rgba(124,58,237,0.18) 0%, transparent 60%);
      background-attachment: fixed;
    }

    /* 自定义玻璃拟态卡片 */
    .glass-card {
      background: rgba(255, 255, 255, 0.03);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: var(--radius-2xl);
      box-shadow: 0 8px 32px rgba(0,0,0,0.4);
    }

    .glass-card-hover {
      transition: all 0.3s ease;
    }
    .glass-card-hover:hover {
      background: rgba(255, 255, 255, 0.07);
      border-color: rgba(124, 58, 237, 0.4);
      box-shadow: 0 12px 36px rgba(124, 58, 237, 0.25);
      transform: translateY(-4px);
    }

    /* 自定义霓虹按钮 */
    .btn-primary {
      background: var(--cta);
      color: #0F0A1A;
      font-weight: 700;
      padding: 0.85rem 2.2rem;
      border-radius: 3rem;
      box-shadow: 0 0 24px rgba(245, 158, 11, 0.4);
      transition: all 0.25s;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      letter-spacing: 0.5px;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background: #FBBF24;
      box-shadow: 0 0 36px rgba(245, 158, 11, 0.7);
      transform: scale(1.02);
    }

    .btn-outline {
      border: 1px solid rgba(124, 58, 237, 0.5);
      color: white;
      padding: 0.85rem 2.2rem;
      border-radius: 3rem;
      background: transparent;
      font-weight: 600;
      transition: all 0.25s;
      backdrop-filter: blur(8px);
      cursor: pointer;
    }
    .btn-outline:hover {
      background: rgba(124, 58, 237, 0.25);
      border-color: #7C3AED;
      box-shadow: 0 0 20px rgba(124,58,237,0.5);
    }

    /* 导航卡片入口 */
    .nav-chip {
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(8px);
      padding: 0.5rem 1.2rem;
      border-radius: 2rem;
      font-size: 0.9rem;
      font-weight: 500;
      color: #ddd;
      transition: 0.2s;
      border: 1px solid transparent;
    }
    .nav-chip:hover {
      background: rgba(124,58,237,0.2);
      color: white;
      border-color: rgba(124,58,237,0.5);
    }

    /* 手风琴动画 */
    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease-in-out, padding 0.3s;
      padding: 0 1rem;
    }
    .faq-item.active .faq-content {
      max-height: 200px;
      padding: 0.75rem 1rem;
    }
    .faq-chevron {
      transition: transform 0.3s;
    }
    .faq-item.active .faq-chevron {
      transform: rotate(180deg);
    }

    /* 背景装饰 */
    .hero-glow {
      background: radial-gradient(circle at 50% 20%, rgba(124,58,237,0.3) 0%, transparent 55%);
    }
    .data-grid-bg {
      background-image: radial-gradient(rgba(124,58,237,0.15) 1px, transparent 1px);
      background-size: 40px 40px;
    }
    @media (max-width: 768px) {
      .nav-chips-container {
        display: none;
      }
      .mobile-menu {
        display: block;
      }
    }