body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background-color: #01737c; 
            color: #333;
        }
        .header-bg {
            background: linear-gradient(to right, #667eea, #764ba2); 
        }
        .card {
            transition: transform 0.3s ease-in-out, box-shadow 0.3s ease-in-out;
            border-radius: 12px;
            overflow: hidden;
            background-color: #ffffff;
        }
        .card:hover {
            transform: translateY(-8px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
        }
        .button-primary {
            background-color: #4CAF50; 
            color: white;
            padding: 12px 28px; 
            border-radius: 8px;
            transition: background-color 0.3s ease, transform 0.3s ease;
            font-size: 1.125rem; 
        }
        .button-primary:hover {
            background-color: #45a049;
            transform: scale(1.05);
        }
        .footer-bg {
              background: linear-gradient(to right, #667eea, #764ba2); 
            color: #ecf0f1;
        }
        .hover-underline:hover {
            text-decoration: underline;
        }
        #mobile-menu-button {
            display: none; 
        }
        #mobile-menu {
            display: none; 
        }

        @media (max-width: 768px) {
            .header-bg .container {
                flex-direction: column;
                align-items: flex-start;
            }
            .header-bg nav {
                display: none; 
                width: 100%;
            }
            .header-bg nav ul {
                flex-direction: column;
                width: 100%;
                margin-top: 1rem;
            }
            .header-bg nav ul li {
                width: 100%;
                text-align: center;
                padding: 0.5rem 0;
            }
            #mobile-menu-button {
                display: block;
                position: absolute;
                right: 1.5rem;
                top: 1.5rem;
                background: none;
                border: none;
                color: white;
                font-size: 1.5rem;
                cursor: pointer;
            }
            #mobile-menu.active {
                display: block;
            }
            .grid {
                grid-template-columns: 1fr; 
            }
        }