.btn {
            display: inline-block;
            padding: 15px 30px;
            font-size: 1.1rem;
            font-weight: 600;
            color: #fff;
            background: #0066cc;
            text-decoration: none;
            border-radius: 6px;
            transition: background 0.2s ease, transform 0.1s ease;
        }
        .btn:hover {
            background: #004c99;
        }
        .btn:active {
            transform: translateY(2px);
        }