/* roulang page: index */
:root {
      --electric: #6C3CF0;
      --neon: #00F0FF;
      --deep: #0A0E1A;
      --glass: rgba(255,255,255,0.05);
      --border-glass: rgba(255,255,255,0.12);
      --text-primary: #F0F2FF;
      --text-secondary: #AEB4CC;
      --radius-card: 16px;
      --radius-btn: 8px;
      --shadow-glow: 0 8px 32px rgba(108,60,240,0.25);
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
      background-color: var(--deep);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }
    .glass-panel {
      background: var(--glass);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border: 1px solid var(--border-glass);
      border-radius: var(--radius-card);
      box-shadow: 0 8px 30px rgba(0,0,0,0.5);
    }
    .neon-text {
      color: var(--neon);
    }
    .electric-text {
      background: linear-gradient(135deg, #6C3CF0 0%, #00F0FF 90%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .btn-glow {
      background: linear-gradient(135deg, #6C3CF0 0%, #00C8E0 100%);
      border: none;
      transition: all 0.3s ease;
      box-shadow: 0 0 12px rgba(0,240,255,0.5);
    }
    .btn-glow:hover {
      box-shadow: 0 0 25px rgba(0,240,255,0.8);
      transform: translateY(-2px);
    }
    .card-hover:hover {
      border-color: var(--neon);
      box-shadow: 0 0 22px rgba(0,240,255,0.4);
      transform: translateY(-6px);
    }
    input:focus, textarea:focus {
      outline: none;
      border-color: var(--neon);
      box-shadow: 0 0 15px rgba(0,240,255,0.5);
    }
    .nav-active {
      border-bottom: 2px solid var(--neon);
      text-shadow: 0 0 8px var(--neon);
    }
    .data-number {
      font-family: 'Fira Code', 'Orbitron', monospace;
      color: var(--neon);
      text-shadow: 0 0 8px rgba(0,240,255,0.6);
    }
    @media (max-width: 768px) {
      .mobile-menu {
        display: none;
      }
      .mobile-menu.open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(10,14,26,0.96);
        backdrop-filter: blur(25px);
        padding: 24px;
        border-bottom: 1px solid var(--border-glass);
      }
    }
    /* 网格背景纹理 */
    .bg-grid {
      background-image: 
        linear-gradient(rgba(108,60,240,0.08) 1px, transparent 1px),
        linear-gradient(90deg, rgba(108,60,240,0.08) 1px, transparent 1px);
      background-size: 40px 40px;
      background-position: center center;
    }
    /* 手风琴动画 */
    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
    }
    .faq-item.open .faq-content {
      max-height: 180px;
    }
    .faq-icon {
      transition: transform 0.3s ease;
    }
    .faq-item.open .faq-icon {
      transform: rotate(45deg);
    }