/* roulang page: index */
:root {
      --primary: #10b981;
      --primary-dark: #059669;
      --accent: #f97316;
      --bg-light: #f8fafc;
      --text-main: #0f172a;
      --text-body: #334155;
      --text-muted: #64748b;
      --card-radius: 20px;
      --card-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.05);
      --card-hover-shadow: 0 16px 32px -4px rgba(16, 185, 129, 0.12);
    }
    html {
      scroll-behavior: smooth;
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
    }
    body {
      background-color: var(--bg-light);
      color: var(--text-body);
      overflow-x: hidden;
    }
    .custom-card {
      border-radius: var(--card-radius);
      box-shadow: var(--card-shadow);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      border: 1px solid rgba(0, 0, 0, 0.05);
    }
    .custom-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-hover-shadow);
      border-color: rgba(16, 185, 129, 0.2);
    }
    .btn-gradient {
      background: linear-gradient(135deg, #10b981 0%, #059669 100%);
      transition: all 0.25s ease;
    }
    .btn-gradient:hover {
      background: linear-gradient(135deg, #059669 0%, #047857 100%);
      box-shadow: 0 8px 20px rgba(16, 185, 129, 0.3);
      transform: translateY(-1px);
    }
    .btn-accent {
      background: linear-gradient(135deg, #f97316 0%, #ea580c 100%);
      transition: all 0.25s ease;
    }
    .btn-accent:hover {
      box-shadow: 0 8px 20px rgba(249, 115, 22, 0.35);
      transform: translateY(-1px);
    }