/* roulang page: index */
:root {
      --bg-dark: #050b14;
      --bg-surface: rgba(13, 25, 48, 0.72);
      --border-glow: rgba(56, 189, 248, 0.22);
      --accent-cyan: #06b6d4;
      --accent-sky: #38bdf8;
      --accent-green: #10b981;
      --text-white: #f8fafc;
      --text-muted: #94a3b8;
    }
    
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      background-color: var(--bg-dark);
      color: var(--text-white);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      overflow-x: hidden;
      line-height: 1.6;
    }

    /* 玻璃拟态卡片 */
    .glass-card {
      background: var(--bg-surface);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--border-glow);
      border-radius: 1rem;
      transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .glass-card:hover {
      border-color: rgba(6, 182, 212, 0.6);
      transform: translateY(-4px);
      box-shadow: 0 16px 36px -12px rgba(6, 182, 212, 0.25);
    }

    /* 发光 CTA 按钮 */
    .btn-glow-primary {
      background: linear-gradient(135deg, #06b6d4 0%, #0284c7 100%);
      color: #ffffff;
      box-shadow: 0 0 20px rgba(6, 182, 212, 0.4);
      transition: all 0.3s ease;
      position: relative;
      overflow: hidden;
    }
    .btn-glow-primary:hover {
      box-shadow: 0 0 32px rgba(56, 189, 248, 0.7);
      transform: translateY(-2px);
    }

    .btn-glow-outline {
      background: rgba(15, 23, 42, 0.6);
      border: 1px solid rgba(56, 189, 248, 0.45);
      color: #38bdf8;
      backdrop-filter: blur(8px);
      transition: all 0.3s ease;
    }
    .btn-glow-outline:hover {
      border-color: #06b6d4;
      background: rgba(6, 182, 212, 0.15);
      box-shadow: 0 0 24px rgba(6, 182, 212, 0.35);
      color: #ffffff;
      transform: translateY(-2px);
    }

    /* 科技背景网格 */
    .tech-bg-grid {
      background-size: 40px 40px;
      background-image: 
        linear-gradient(to right, rgba(56, 189, 248, 0.05) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(56, 189, 248, 0.05) 1px, transparent 1px);
    }

    /* 光斑装饰 */
    .glow-orb {
      position: absolute;
      border-radius: 9999px;
      filter: blur(90px);
      pointer-events: none;
      z-index: 0;
    }

    /* 手风琴动效 */
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.3s ease;
    }
    .faq-item.active .faq-answer {
      max-height: 240px;
      padding-top: 0.75rem;
    }
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }