/* roulang page: index */
:root {
      --primary: #1e40af;
      --accent: #0284c7;
      --bg-page: #f8fafc;
      --text-main: #0f172a;
      --text-muted: #64748b;
      --card-border: #e2e8f0;
    }
    body {
      background-color: var(--bg-page);
      color: var(--text-main);
      overflow-x: hidden;
    }
    .hero-bg-overlay {
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.92) 0%, rgba(30, 64, 175, 0.85) 100%);
    }
    .tech-grid {
      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);
    }
    .card-hover {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 24px -6px rgba(30, 64, 175, 0.12), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
      border-color: #93c5fd;
    }
    details summary::-webkit-details-marker {
      display: none;
    }
    details[open] summary svg {
      transform: rotate(180deg);
    }