/* roulang page: index */
/* 设计变量与全局重置 */
    :root {
      --primary: #7C3AED;
      --primary-light: #A855F7;
      --accent: #06B6D4;
      --bg-deep: #0B0B1A;
      --bg-card: rgba(255, 255, 255, 0.05);
      --border-light: rgba(255, 255, 255, 0.1);
      --text-soft: rgba(255, 255, 255, 0.8);
      --text-dim: rgba(255, 255, 255, 0.6);
      --shadow-glow: 0 0 20px rgba(124, 58, 237, 0.4);
      --radius-2xl: 1.5rem;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: 'Inter', system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
      background: radial-gradient(circle at 20% 10%, #1A0A2E 0%, #0B0B1A 90%);
      color: rgba(255, 255, 255, 0.9);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    /* 自定义玻璃拟态卡片 */
    .glass-card {
      background: rgba(255, 255, 255, 0.05);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-2xl);
      box-shadow: inset 0 1px 0 rgba(255,255,255,0.1);
      transition: transform 0.25s ease, border-color 0.25s, box-shadow 0.25s;
    }
    .glass-card:hover {
      transform: translateY(-6px);
      border-color: rgba(168, 85, 247, 0.5);
      box-shadow: 0 20px 30px -15px rgba(124, 58, 237, 0.4), inset 0 1px 0 rgba(255,255,255,0.15);
    }
    /* 导航玻璃效果 */
    .nav-glass {
      background: rgba(11, 11, 26, 0.7);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    /* 霓虹发光文字 */
    .text-glow {
      text-shadow: 0 0 12px rgba(124, 58, 237, 0.7);
    }
    .border-glow {
      box-shadow: 0 0 18px rgba(6, 182, 212, 0.3);
    }
    /* 按钮动画 */
    .btn-primary {
      background: linear-gradient(135deg, #7C3AED, #06B6D4);
      border: none;
      border-radius: 9999px;
      color: white;
      font-weight: 600;
      transition: all 0.3s ease;
      box-shadow: 0 8px 18px rgba(124, 58, 237, 0.35);
    }
    .btn-primary:hover {
      box-shadow: 0 0 25px rgba(124, 58, 237, 0.7), 0 10px 20px rgba(0,0,0,0.4);
      transform: scale(1.05);
      background: linear-gradient(135deg, #A855F7, #22D3EE);
    }
    .btn-outline-glow {
      background: transparent;
      border: 1px solid rgba(6, 182, 212, 0.7);
      border-radius: 9999px;
      color: #06B6D4;
      font-weight: 600;
      transition: all 0.3s ease;
    }
    .btn-outline-glow:hover {
      border-color: #A855F7;
      color: #A855F7;
      box-shadow: 0 0 20px rgba(168, 85, 247, 0.5);
      background: rgba(168, 85, 247, 0.08);
    }
    /* 手风琴样式 */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .faq-question {
      cursor: pointer;
      transition: color 0.2s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s;
      color: rgba(255,255,255,0.75);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 1.2rem;
    }
    .faq-item.active .faq-question {
      color: #A855F7;
    }
    /* 响应式调整 */
    @media (max-width: 768px) {
      .mobile-hidden {
        display: none;
      }
      .mobile-stack {
        flex-direction: column;
        align-items: flex-start;
      }
    }
    /* 汉堡菜单抽屉 */
    #mobile-menu {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: rgba(11, 11, 26, 0.95);
      backdrop-filter: blur(20px);
    }
    #mobile-menu.open {
      max-height: 400px;
    }