/* roulang page: index */
:root {
      --bg-dark: #0D1117;
      --neon-green: #00F5A0;
      --brand-accent: #10B981;
    }
    html {
      scroll-behavior: smooth;
      font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    }
    .neon-glow {
      box-shadow: 0 0 25px rgba(0, 245, 160, 0.25);
    }
    .neon-border-glow:hover {
      border-color: #00F5A0;
      box-shadow: 0 0 20px rgba(0, 245, 160, 0.2);
    }
    .hero-mask {
      background: linear-gradient(135deg, rgba(13, 17, 23, 0.94) 0%, rgba(13, 17, 23, 0.78) 60%, rgba(13, 17, 23, 0.96) 100%);
    }
    .glass-nav {
      background: rgba(13, 17, 23, 0.88);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
    }
    .glass-card {
      background: rgba(31, 41, 55, 0.6);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      border: 1px solid rgba(255, 255, 255, 0.08);
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
    }
    .accordion-content.active {
      max-height: 300px;
    }