/* roulang page: index */
:root {
      --color-primary: #0F172A;
      --color-accent: #0284C7;
      --color-accent-hover: #0369A1;
      --color-bg-light: #F8FAFC;
      --color-border: #E2E8F0;
      --radius-card: 1rem;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
      color: #334155;
      background-color: #FFFFFF;
      overflow-x: hidden;
      line-height: 1.6;
    }
    .gradient-hero-btn {
      background: linear-gradient(135deg, #0369A1 0%, #0EA5E9 50%, #38BDF8 100%);
    }
    .gradient-hero-btn:hover {
      filter: brightness(1.08);
      transform: translateY(-1px);
    }
    .gradient-badge {
      background: linear-gradient(135deg, rgba(2, 132, 199, 0.12) 0%, rgba(56, 189, 248, 0.18) 100%);
      color: #0369A1;
      border: 1px solid rgba(14, 165, 233, 0.25);
    }
    .gradient-badge-dark {
      background: linear-gradient(135deg, rgba(14, 165, 233, 0.2) 0%, rgba(56, 189, 248, 0.1) 100%);
      color: #38BDF8;
      border: 1px solid rgba(56, 189, 248, 0.3);
    }
    .card-hover-effect {
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .card-hover-effect:hover {
      transform: translateY(-4px);
      box-shadow: 0 20px 25px -5px rgba(15, 23, 42, 0.08), 0 10px 10px -5px rgba(15, 23, 42, 0.04);
    }
    .industrial-grid-bg {
      background-size: 32px 32px;
      background-image: 
        linear-gradient(to right, rgba(255, 255, 255, 0.05) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
    }
    details summary::-webkit-details-marker {
      display: none;
    }