* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 20px;
        }

        .login-container {
            background: white;
            border-radius: 20px;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
            overflow: hidden;
            max-width: 900px;
            width: 100%;
            display: flex;
            flex-direction: row;
        }

        .login-left {
            flex: 1;
            background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
            color: white;
            padding: 60px 40px;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            text-align: center;
        }

        .login-left i {
            font-size: 80px;
            margin-bottom: 30px;
            animation: float 3s ease-in-out infinite;
        }

        @keyframes float {

            0%,
            100% {
                transform: translateY(0);
            }

            50% {
                transform: translateY(-20px);
            }
        }

        .login-left h1 {
            font-size: 32px;
            margin-bottom: 15px;
        }

        .login-left p {
            font-size: 16px;
            opacity: 0.9;
            line-height: 1.6;
        }

        .version-badge {
            margin-top: 20px;
            background: rgba(255, 255, 255, 0.2);
            padding: 8px 20px;
            border-radius: 20px;
            font-size: 14px;
            font-weight: 600;
        }

        .login-right {
            flex: 1;
            padding: 60px 40px;
        }

        .login-right h2 {
            font-size: 28px;
            color: #1f2937;
            margin-bottom: 10px;
        }

        .login-right p {
            color: #6b7280;
            margin-bottom: 30px;
        }

        .form-group {
            margin-bottom: 25px;
        }

        .form-group label {
            display: block;
            color: #374151;
            font-weight: 600;
            margin-bottom: 8px;
            font-size: 14px;
        }

        .input-group {
            position: relative;
        }

        .input-group i {
            position: absolute;
            left: 15px;
            top: 50%;
            transform: translateY(-50%);
            color: #9ca3af;
            font-size: 16px;
        }

        .form-control {
            width: 100%;
            padding: 12px 15px 12px 45px;
            border: 2px solid #e5e7eb;
            border-radius: 10px;
            font-size: 15px;
            transition: all 0.3s;
        }

        .form-control:focus {
            outline: none;
            border-color: #2563eb;
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
        }

        .btn-login {
            width: 100%;
            padding: 14px;
            background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
            color: white;
            border: none;
            border-radius: 10px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: transform 0.2s, box-shadow 0.2s;
        }

        .btn-login:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 20px rgba(37, 99, 235, 0.3);
        }

        .btn-login:active {
            transform: translateY(0);
        }

        .demo-credentials {
            margin-top: 30px;
            padding: 20px;
            background: #f9fafb;
            border-radius: 10px;
            border-left: 4px solid #2563eb;
        }

        .demo-credentials h4 {
            color: #1f2937;
            margin-bottom: 15px;
            font-size: 14px;
        }

        .credential-item {
            display: flex;
            justify-content: space-between;
            padding: 8px 0;
            border-bottom: 1px solid #e5e7eb;
        }

        .credential-item:last-child {
            border-bottom: none;
        }

        .credential-item strong {
            color: #374151;
            font-size: 13px;
        }

        .credential-item span {
            color: #6b7280;
            font-size: 13px;
            font-family: monospace;
        }

        .alert {
            padding: 12px 15px;
            border-radius: 8px;
            margin-bottom: 20px;
            display: none;
        }

        .alert-error {
            background: #fef2f2;
            color: #991b1b;
            border: 1px solid #fecaca;
        }

        .alert-success {
            background: #f0fdf4;
            color: #166534;
            border: 1px solid #bbf7d0;
        }

        /* Mobile Responsive */
        @media (max-width: 768px) {
            .login-container {
                flex-direction: column;
                max-width: 100%;
            }

            .login-left {
                padding: 40px 30px;
            }

            .login-left i {
                font-size: 60px;
                margin-bottom: 20px;
            }

            .login-left h1 {
                font-size: 24px;
                margin-bottom: 10px;
            }

            .login-left p {
                font-size: 14px;
            }

            .version-badge {
                margin-top: 15px;
                font-size: 12px;
                padding: 6px 15px;
            }

            .login-right {
                padding: 40px 30px;
            }

            .login-right h2 {
                font-size: 22px;
            }

            .login-right p {
                font-size: 14px;
                margin-bottom: 25px;
            }

            .form-group {
                margin-bottom: 20px;
            }

            .form-control {
                padding: 10px 15px 10px 40px;
                font-size: 14px;
            }

            .btn-login {
                padding: 12px;
                font-size: 15px;
            }

            .demo-credentials {
                padding: 15px;
                margin-top: 25px;
            }

            .demo-credentials h4 {
                font-size: 13px;
                margin-bottom: 12px;
            }

            .credential-item {
                padding: 6px 0;
            }

            .credential-item strong,
            .credential-item span {
                font-size: 12px;
            }
        }

        @media (max-width: 480px) {
            body {
                padding: 10px;
            }

            .login-left {
                padding: 30px 20px;
            }

            .login-left i {
                font-size: 50px;
            }

            .login-left h1 {
                font-size: 20px;
            }

            .login-right {
                padding: 30px 20px;
            }

            .login-right h2 {
                font-size: 20px;
            }

            .form-group label {
                font-size: 13px;
            }

            .form-control {
                font-size: 13px;
            }

            .btn-login {
                font-size: 14px;
            }
        }

        /* Loading Animation */
        .btn-login.loading {
            pointer-events: none;
            opacity: 0.7;
        }

        .btn-login.loading::after {
            content: "";
            width: 16px;
            height: 16px;
            margin-left: 10px;
            border: 2px solid #ffffff;
            border-top-color: transparent;
            border-radius: 50%;
            display: inline-block;
            animation: spin 0.6s linear infinite;
        }

        @keyframes spin {
            to {
                transform: rotate(360deg);
            }
        }