body {
            background: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), 
                        url('img/isu_bg.png') no-repeat center center fixed;
            background-size: cover;
            min-height: 100vh;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        .login-container {
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 20px;
        }
        
        .login-card {
            background: transparent;
            border-radius: 20px;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.2);
            padding: 40px;
            max-width: 450px;
            width: 100%;
            animation: fadeInUp 0.8s ease-out;
        }
        
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        .logo-container {
            text-align: center;
            margin-bottom: 2rem;
        }
        
        .logo-container img {
            background: transparent;
            height: 80px;
            margin-bottom: 1rem;
            filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.2));
        }
        
      
        
        .system-subtitle {
            color: #ffffff;
            font-size: 1rem;
            margin-bottom: 0;
            text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.8);
        }
        
        .form-control {
            border: 2px solid #e9ecef;
            border-radius: 10px;
            padding: 12px 15px;
            transition: all 0.3s ease;
            background: rgba(255, 255, 255, 0.9);
        }
        
        .form-control:focus {
            border-color: #dc3545;
            box-shadow: 0 0 0 0.2rem rgba(220, 53, 69, 0.25);
            background: white;
        }
        
        .input-group-text {
            background: #28a745;
            color: white;
            border: 2px solid #28a745;
            border-radius: 10px 0 0 10px;
        }
        
        .btn-primary-red {
            background: linear-gradient(135deg, #28a745, #20c997);
            border: none;
            border-radius: 10px;
            padding: 12px 20px;
            font-weight: 600;
            font-size: 1.1rem;
            transition: all 0.3s ease;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            color: white;
        }
        
        .btn-primary-red:hover {
            background: linear-gradient(135deg, #20c997, #17a2b8);
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(40, 167, 69, 0.4);
            color: white;
        }

        .btn-signup {
            background: rgba(255, 255, 255, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.3);
            border-radius: 8px;
            padding: 8px 16px;
            font-weight: 500;
            font-size: 0.85rem;
            transition: all 0.3s ease;
            color: #ffffff;
            text-decoration: none;
            display: inline-block;
            margin-top: 8px;
            backdrop-filter: blur(10px);
        }
        
        .btn-signup:hover {
            background: rgba(255, 255, 255, 0.2);
            border-color: rgba(255, 255, 255, 0.5);
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(255, 255, 255, 0.1);
            color: #ffffff;
            text-decoration: none;
        }
        
        .btn-outline-secondary {
            border: 2px solid rgba(255, 255, 255, 0.4);
            border-left: none;
            border-radius: 0 10px 10px 0;
            background: rgba(255, 255, 255, 0.2);
            color: #333;
        }
        
        .btn-outline-secondary:hover {
            background: rgba(255, 255, 255, 0.3);
            border-color: #28a745;
            color: #28a745;
        }
        
        .alert-danger {
            border: none;
            border-radius: 10px;
            background: rgba(220, 53, 69, 0.2);
            border-left: 4px solid #dc3545;
            color: #ffffff;
            font-weight: 500;
            text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
        }
        
        .form-label {
            font-weight: 600;
            color: #ffffff;
            margin-bottom: 8px;
            text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.8);
        }
        
        .contact-info {
            text-align: center;
            margin-top: 1.5rem;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255, 255, 255, 0.3);
        }
        
        .contact-info small {
            color: #ffffff;
            line-height: 1.5;
            text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.8);
        }

        .contact-info .separator {
            margin: 0.5rem 0;
            color: rgba(255, 255, 255, 0.7);
        }

        /* Success Modal Styles */
        .success-modal {
            background: rgba(0, 0, 0, 0.8);
            backdrop-filter: blur(5px);
        }

        .success-modal-content {
            background: linear-gradient(135deg, #28a745, #20c997);
            border: none;
            border-radius: 20px;
            box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5);
            animation: modalSlideIn 0.5s ease-out;
        }

        @keyframes modalSlideIn {
            from {
                opacity: 0;
                transform: scale(0.7) translateY(-50px);
            }
            to {
                opacity: 1;
                transform: scale(1) translateY(0);
            }
        }

        .success-icon {
            font-size: 4rem;
            color: #ffffff;
            margin-bottom: 1rem;
            text-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
            animation: bounceIn 0.8s ease-out 0.2s both;
        }

        @keyframes bounceIn {
            0% {
                opacity: 0;
                transform: scale(0.3);
            }
            50% {
                opacity: 1;
                transform: scale(1.05);
            }
            70% {
                transform: scale(0.9);
            }
            100% {
                opacity: 1;
                transform: scale(1);
            }
        }

        .success-title {
            color: #ffffff;
            font-weight: 700;
            font-size: 1.8rem;
            margin-bottom: 0.5rem;
            text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
        }

        .success-message {
            color: #ffffff;
            font-size: 1.1rem;
            opacity: 0.9;
            text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
        }

        /* Loading Spinner Styles */
        .loading-container {
            margin-top: 1.5rem;
        }

        .loading-spinner {
            width: 50px;
            height: 50px;
            border: 4px solid rgba(255, 255, 255, 0.3);
            border-top: 4px solid #ffffff;
            border-radius: 50%;
            animation: spin 1s linear infinite;
            margin: 0 auto;
        }

        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        .loading-text {
            color: #ffffff;
            font-size: 0.95rem;
            margin-top: 1rem;
            opacity: 0.9;
            text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
        }
        
        /* Responsive adjustments */
        @media (max-width: 768px) {
            .login-card {
                margin: 20px;
                padding: 30px 25px;
            }
            
            .system-title {
                font-size: 1.5rem;
            }
            
            .logo-container img {
                height: 70px;
            }

            .success-icon {
                font-size: 3rem;
            }

            .success-title {
                font-size: 1.5rem;
            }

            .loading-spinner {
                width: 40px;
                height: 40px;
            }

            .btn-signup {
                font-size: 0.8rem;
                padding: 6px 12px;
                margin-left: 4px;
                margin-top: 4px;
                display: inline-block;
            }
        }