/* roulang page: index */
:root {
      --bg-dark: #0B0E14;
      --bg-surface: #121721;
      --color-primary: #6366F1;
      --color-accent: #10B981;
      --text-main: #FFFFFF;
      --text-muted: #94A3B8;
      --border-subtle: rgba(255, 255, 255, 0.08);
      --radius-box: 1rem;
    }
    * {
      box-sizing: border-box;
      scroll-behavior: smooth;
    }
    body {
      background-color: var(--bg-dark);
      color: var(--text-muted);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.75;
      overflow-x: hidden;
    }
    .hero-glow {
      background: radial-gradient(circle at 50% 30%, rgba(99, 102, 241, 0.22) 0%, rgba(11, 14, 20, 0) 70%);
    }
    .custom-card {
      background: rgba(18, 23, 33, 0.75);
      border: 1px solid var(--border-subtle);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .custom-card:hover {
      border-color: rgba(99, 102, 241, 0.45);
      transform: translateY(-4px);
    }
    .btn-gradient {
      background: linear-gradient(135deg, #6366F1 0%, #7C3AED 100%);
      transition: all 0.25s ease;
    }
    .btn-gradient:hover {
      filter: brightness(1.15);
      box-shadow: 0 0 24px rgba(99, 102, 241, 0.45);
    }