/* roulang page: index */
:root {
      --bg-dark: #030712;
      --bg-gradient: #0A1128;
      --bg-block: #060D1E;
      --primary-cyan: #00D2FF;
      --primary-blue: #0066FF;
      --accent-green: #10B981;
      --accent-purple: #7C3AED;
      --text-main: #F9FAFB;
      --text-muted: #9CA3AF;
      --border-glow: rgba(0, 210, 255, 0.2);
    }

    body {
      background-color: var(--bg-dark);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      overflow-x: hidden;
    }

    .glass-card {
      background: rgba(15, 23, 42, 0.72);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--border-glow);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .glass-card:hover {
      border-color: rgba(0, 210, 255, 0.5);
      box-shadow: 0 0 25px rgba(0, 210, 255, 0.15);
      transform: translateY(-2px);
    }

    .btn-glow-primary {
      background: linear-gradient(135deg, #00D2FF 0%, #0066FF 100%);
      box-shadow: 0 0 20px rgba(0, 210, 255, 0.45);
      transition: all 0.25s ease;
    }
    .btn-glow-primary:hover {
      filter: brightness(1.15);
      box-shadow: 0 0 28px rgba(0, 210, 255, 0.65);
      transform: translateY(-2px);
    }

    .btn-glow-outline {
      background: rgba(0, 210, 255, 0.05);
      border: 1px solid var(--primary-cyan);
      box-shadow: inset 0 0 12px rgba(0, 210, 255, 0.2);
      transition: all 0.25s ease;
    }
    .btn-glow-outline:hover {
      background: rgba(0, 210, 255, 0.15);
      box-shadow: 0 0 18px rgba(0, 210, 255, 0.35);
      transform: translateY(-2px);
    }

    .circuit-grid {
      background-image: radial-gradient(rgba(0, 210, 255, 0.1) 1px, transparent 1px);
      background-size: 32px 32px;
    }

    /* 滚动条定制 */
    ::-webkit-scrollbar {
      width: 8px;
    }
    ::-webkit-scrollbar-track {
      background: #030712;
    }
    ::-webkit-scrollbar-thumb {
      background: #1e293b;
      border-radius: 4px;
    }
    ::-webkit-scrollbar-thumb:hover {
      background: #00D2FF;
    }

    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
    }
    .accordion-item.active .accordion-content {
      max-height: 280px;
    }
    .accordion-item.active .accordion-icon {
      transform: rotate(180deg);
    }