body {
            font-family: 'Poppins', sans-serif;
        }
        .navbar {
            background-color: #03a9a7; 
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
            padding: 12px 0;
        }
        .navbar-brand img {
            height: 40px; 
            width: auto;
        }
        .nav-link {
            color: #ffffff !important;
            font-weight: 500;
            padding: 10px 15px;
            margin: 0 5px;
            border-radius: 8px;
            transition: all 0.3s ease;
        }
        .nav-link:hover {
            background-color: #facc15;
            color: #065f46 !important;
            transform: scale(1.05);
            box-shadow: 0 0 8px rgba(250, 204, 21, 0.5);
        }
        .nav-link.active {
            background-color: #facc15;
            color: #065f46 !important;
        }
        .nav-link.register {
            background-color: #c2410c; /* Cam đất */
            border: 2px solid #ffffff;
            border-radius: 25px;
            padding: 8px 20px;
            color: #ffffff !important;
            font-weight: 600;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
        }
        .nav-link.register:hover {
            background-color: #9a3412; /* Cam đậm hơn */
            box-shadow: 0 0 10px rgba(194, 65, 12, 0.6);
            transform: scale(1.1);
        }
        .nav-link.register i {
            margin-right: 5px;
        }
        .navbar-toggler {
            border-color: #ffffff;
        }
        .navbar-toggler-icon {
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3E%3Cpath stroke='rgba(255, 255, 255, 1)' stroke-width='2' stroke-linecap='round' stroke-miterlimit='10' d='M4 7h22M4 15h22M4 23h22'/%3E%3C/svg%3E");
        }
        @media (max-width: 991px) {
            .navbar-nav {
                margin-top: 10px;
            }
            .nav-link {
                margin: 5px 0;
            }
            .nav-link.register {
                width: 100%;
                justify-content: center;
            }
        }