/* roulang page: index */
:root {
      --color-primary: #0052FF;
      --color-primary-dark: #0A1128;
      --color-accent: #00F0FF;
      --color-accent-green: #00E599;
      --color-obsidian: #0B0F19;
      --color-surface: #F8FAFC;
      --color-surface-alt: #F1F5F9;
      --color-border: rgba(226, 232, 240, 0.85);
      --shadow-subtle: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
      --shadow-hover: 0 12px 28px -4px rgba(0, 82, 255, 0.12);
    }
    body {
      background-color: var(--color-surface);
      color: #1E293B;
      font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.7;
    }
    .custom-border {
      border: 1px solid var(--color-border);
    }
    .card-hover {
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(0, 82, 255, 0.35);
    }
    details summary::-webkit-details-marker {
      display: none;
    }