/* roulang page: index */
:root {
      --primary: #0F2B48;
      --accent: #00C9A7;
      --dark: #0A121E;
      --light-bg: #F8FAFC;
      --text-main: #0B132B;
      --text-body: #334155;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
    }
    * {
      box-sizing: border-box;
      scroll-behavior: smooth;
    }
    body {
      background-color: var(--light-bg);
      color: var(--text-body);
      font-family: 'Inter', -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
      line-height: 1.7;
    }
    .custom-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
      box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.05);
    }
    .custom-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 24px -4px rgba(15, 43, 72, 0.08);
      border-color: #CBD5E1;
    }
    .accent-btn {
      background-color: var(--accent);
      color: #0A121E;
      font-weight: 600;
      transition: all 0.2s ease-in-out;
    }
    .accent-btn:hover {
      background-color: #00b092;
      box-shadow: 0 4px 14px rgba(0, 201, 167, 0.35);
    }
    .outline-btn {
      border: 1px solid #CBD5E1;
      color: var(--primary);
      transition: all 0.2s ease-in-out;
    }
    .outline-btn:hover {
      background: #F1F5F9;
      border-color: #94A3B8;
    }
    details summary::-webkit-details-marker {
      display: none;
    }