/* roulang page: index */
:root {
      --primary: #1d4ed8;
      --primary-hover: #2563eb;
      --secondary: #0ea5e9;
      --bg-page: #f8fafc;
      --text-main: #0f172a;
      --text-muted: #64748b;
      --card-border: #e2e8f0;
      --shadow-soft: 0 10px 25px -5px rgba(15, 23, 42, 0.05), 0 8px 10px -6px rgba(15, 23, 42, 0.05);
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      overflow-x: hidden;
    }
    .hero-bg-overlay {
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.88) 0%, rgba(30, 58, 138, 0.85) 100%);
    }
    .custom-shadow {
      box-shadow: var(--shadow-soft);
    }
    .tech-card-hover {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .tech-card-hover:hover {
      transform: translateY(-4px);
      box-shadow: 0 20px 25px -5px rgba(15, 23, 42, 0.1), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
    }