:root {
            --primary: #0056b3;
            --secondary: #007bff;
            --dark: #000;
            --light: #fff;
            --accent: #004a59;
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; line-height: 1.6; color: #333; }
        
        /* Header Utility */
        .container { max-width: 1200px; margin: 0 auto; padding: 0 15px; }
        header { background: var(--light); padding: 20px 0; border-bottom: 2px solid #eee; position: sticky; top: 0; z-index: 1000; }
        .flex-head { display: flex; justify-content: space-between; align-items: center; }
        .web_logo img { height: 60px; }
        .nav-link { text-decoration: none; color: var(--dark); font-weight: 600; padding: 0 15px; }
        
        /* Layout Modules */
        .hero { height: 500px; background-size: cover; background-position: center; display: flex; align-items: center; color: var(--light); position: relative; }
        .hero::before { content: ''; position: absolute; top:0; left:0; width:100%; height:100%; background: rgba(0,0,0,0.4); }
        .hero-content { position: relative; z-index: 1; }
        
        .section { padding: 80px 0; }
        .grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
        
        .card { padding: 20px; border: 1px solid #eee; transition: 0.3s; }
        .card:hover { box-shadow: 0 10px 20px rgba(0,0,0,0.1); }
        
        /* CSS Icon Alternatives */
        .icon { width: 60px; height: 60px; background: #eee; margin-bottom: 15px; display: flex; align-items: center; justify-content: center; border-radius: 50%; }
        .icon::after { content: '★'; font-size: 24px; color: var(--primary); }
        
        footer { background: var(--dark); color: var(--light); padding: 40px 0; text-align: center; }
        
        @media (max-width: 768px) {
            .flex-head { flex-direction: column; }
            .nav-link { display: block; padding: 10px; }
        }