:root {
            --primary: #0073aa;
            --text: #494949;
            --bg: #ffffff;
            --accent: #f0f8ff;
        }
        * { box-sizing: border-box; }
        body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; line-height: 1.6; color: var(--text); margin: 0; background: var(--bg); }
        
        .site-header { padding: 2rem 1rem; text-align: center; border-bottom: 2px solid var(--accent); }
        .site-title { font-size: 2rem; margin: 0; color: var(--primary); }
        
        .navbar { display: flex; justify-content: center; gap: 1.5rem; padding: 1rem; background: var(--accent); flex-wrap: wrap; }
        .navbar a { text-decoration: none; color: var(--primary); font-weight: bold; }

        .container { max-width: 1000px; margin: 2rem auto; padding: 0 1rem; }
        
        .grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 2rem; margin-top: 2rem; }
        .card { border: 1px solid #eee; padding: 1rem; border-radius: 8px; transition: transform 0.2s; }
        .card:hover { transform: translateY(-5px); box-shadow: 0 4px 10px rgba(0,0,0,0.1); }
        
        .icon-placeholder { 
            width: 100%; aspect-ratio: 1; background: #f9f9f9; 
            display: flex; align-items: center; justify-content: center; 
            border: 2px dashed #ddd; border-radius: 4px; margin-bottom: 1rem;
            font-size: 3rem; color: #ccc;
        }

        .img-constrained { width: 100%; height: auto; border-radius: 8px; box-shadow: 0 2px 5px rgba(0,0,0,0.05); }

        footer { text-align: center; padding: 3rem; border-top: 1px solid #eee; margin-top: 3rem; color: #888; }

        @media (min-width: 768px) { .grid { grid-template-columns: repeat(4, 1fr); } }