/* roulang page: index */
:root {
      --color-accent: #00E599;
      --color-purple: #7000FF;
      --color-bg-dark: #0B0E14;
      --color-bg-steel: #121620;
      --color-surface: #181E29;
      --color-text-main: #FFFFFF;
      --color-text-muted: #94A3B8;
      --border-subtle: rgba(255, 255, 255, 0.08);
      --transition-smooth: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    
    body {
      background-color: var(--color-bg-dark);
      color: var(--color-text-main);
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      overflow-x: hidden;
    }

    .glass-nav {
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      background: rgba(11, 14, 20, 0.85);
      border-bottom: 1px solid var(--border-subtle);
    }

    .interactive-card {
      background: var(--color-surface);
      border: 1px solid var(--border-subtle);
      transition: var(--transition-smooth);
    }
    .interactive-card:hover {
      transform: translateY(-4px);
      border-color: rgba(0, 229, 153, 0.4);
      box-shadow: 0 12px 30px -8px rgba(0, 229, 153, 0.12);
    }

    .glow-btn-primary {
      background: #00E599;
      color: #0B0E14;
      font-weight: 700;
      transition: var(--transition-smooth);
      box-shadow: 0 4px 20px -2px rgba(0, 229, 153, 0.4);
    }
    .glow-btn-primary:hover {
      background: #10f4aa;
      transform: translateY(-2px);
      box-shadow: 0 8px 25px 0 rgba(0, 229, 153, 0.6);
    }

    .section-divider {
      border-top: 1px solid rgba(255, 255, 255, 0.05);
    }

    details > summary {
      list-style: none;
    }
    details > summary::-webkit-details-marker {
      display: none;
    }
    details[open] summary svg {
      transform: rotate(180deg);
    }