/* roulang page: index */
:root {
      --bg-dark: #070B14;
      --panel-bg: rgba(13, 27, 42, 0.72);
      --border-cyan: rgba(0, 240, 255, 0.2);
      --neon-cyan: #00F0FF;
      --text-main: #FFFFFF;
      --text-muted: #94A3B8;
    }
    body {
      background-color: var(--bg-dark);
      color: #E2E8F0;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      line-height: 1.7;
    }
    .glass-card {
      background: var(--panel-bg);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--border-cyan);
      box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    }
    .neon-btn {
      background: linear-gradient(135deg, #00F0FF 0%, #0284C7 100%);
      box-shadow: 0 0 20px rgba(0, 240, 255, 0.35);
      transition: all 0.25s ease-in-out;
    }
    .neon-btn:hover {
      box-shadow: 0 0 28px rgba(0, 240, 255, 0.65);
      transform: translateY(-2px);
    }
    .subtle-pulse {
      animation: pulse-dot 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
    }
    @keyframes pulse-dot {
      0%, 100% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.35; transform: scale(0.85); }
    }
    .code-font {
      font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    }

/* roulang page: category1 */
:root {
      --bg-dark: #070B14;
      --panel-bg: rgba(13, 27, 42, 0.72);
      --border-cyan: rgba(0, 240, 255, 0.2);
      --neon-cyan: #00F0FF;
      --text-main: #FFFFFF;
      --text-muted: #94A3B8;
    }
    body {
      background-color: var(--bg-dark);
      color: #E2E8F0;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      line-height: 1.7;
    }
    .code-font {
      font-family: "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    }
    .glass-card {
      background: var(--panel-bg);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--border-cyan);
      box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    }
    .neon-btn {
      background: linear-gradient(135deg, #00F0FF 0%, #0284C7 100%);
      box-shadow: 0 0 20px rgba(0, 240, 255, 0.35);
      transition: all 0.25s ease-in-out;
    }
    .neon-btn:hover {
      box-shadow: 0 0 28px rgba(0, 240, 255, 0.65);
      transform: translateY(-2px);
    }
    .neon-border-glow {
      box-shadow: 0 0 15px rgba(0, 240, 255, 0.25);
    }
    .subtle-pulse {
      animation: subtleGlow 2.5s infinite ease-in-out;
    }
    @keyframes subtleGlow {
      0%, 100% { opacity: 0.85; transform: scale(1); }
      50% { opacity: 1; transform: scale(1.05); }
    }