/* roulang page: index */
:root {
      --bg-base: #0A111E;
      --bg-card: #0E1A2D;
      --cyan-bright: #00F0B5;
      --blue-bright: #0077FE;
      --orange-bright: #FF6B35;
      --text-main: #FFFFFF;
      --text-sub: #94A3B8;
    }
    body {
      background-color: var(--bg-base);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      overflow-x: hidden;
    }
    .neon-border {
      border: 1px solid rgba(0, 240, 181, 0.2);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .neon-border:hover {
      border-color: rgba(0, 240, 181, 0.8);
      box-shadow: 0 0 20px rgba(0, 240, 181, 0.25);
      transform: translateY(-4px);
    }
    .bg-grid-pattern {
      background-size: 40px 40px;
      background-image: 
        linear-gradient(to right, rgba(0, 119, 254, 0.05) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(0, 119, 254, 0.05) 1px, transparent 1px);
    }
    .accordion-content {
      transition: max-height 0.35s ease-out, opacity 0.3s ease-out;
      max-height: 0;
      opacity: 0;
      overflow: hidden;
    }
    .accordion-item.active .accordion-content {
      max-height: 280px;
      opacity: 1;
    }
    .accordion-item.active .accordion-icon {
      transform: rotate(180deg);
      color: #00F0B5;
    }