:root {
            --primary-color: #3a6186;
            --primary-dark: #89253e;
            --secondary-color: #5f6368;
            --success-color: #28a745;
            --warning-color: #ffc107;
            --danger-color: #dc3545;
            --light-color: #f8f9fa;
            --dark-color: #212529;
            --gradient-primary: linear-gradient(135deg, #3a6186 0%, #89253e 100%);
            --box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
            --card-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
            --border-radius: 8px;
            --border-radius-lg: 12px;
        }
        
        body, html {
            height: 100%;
            font-family: 'Poppins', sans-serif;
        }
        
        .is-invalid {
            border-color: #dc3545 !important;
        }
        
        .invalid-feedback {
            display: none;
            width: 100%;
            margin-top: 0.25rem;
            font-size: 0.875em;
            color: #dc3545;
        }
        
        .invalid-feedback.show {
            display: block;
        }
        
        .alert {
            padding: 0.75rem 1.25rem;
            margin-bottom: 1rem;
            border: 1px solid transparent;
            border-radius: var(--border-radius);
        }
        
        .alert-danger {
            color: #721c24;
            background-color: #f8d7da;
            border-color: #f5c6cb;
            border-left: 4px solid #dc3545;
        }
        
        .alert-success {
            color: #155724;
            background-color: #d4edda;
            border-color: #c3e6cb;
            border-left: 4px solid #28a745;
        }
        
        .btn-spinner {
            display: none;
            margin-right: 8px;
        }
        
        .btn.loading .btn-spinner {
            display: inline-block;
        }
        
        /* Enhanced Styling */
        .main-wrapper {
            height: 100%;
            overflow: hidden;
        }
        
        .login-bg {
            position: relative;
            height: 100vh;
            overflow: hidden;
            padding: 0;
        }
        
        .login-bg::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: var(--gradient-primary);
            opacity: 0.9;
            z-index: 1;
        }
        
        .welcome-login {
            position: relative;
            z-index: 2;
            height: 100vh;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            padding: 30px;
        }
        
        .mentor-course {
            color: white;
            max-width: 600px;
            margin-top: 40px;
        }
        
        .mentor-course h2 {
            font-size: 36px;
            font-weight: 700;
            margin-bottom: 20px;
            line-height: 1.2;
        }
        
        .mentor-course p {
            font-size: 16px;
            opacity: 0.9;
        }
        
        .login-wrap-bg {
            background-color: #ffffff;
            display: flex;
            align-items: center;
            justify-content: center;
            height: 100vh;
            overflow-y: auto;
            padding: 30px;
        }
        
        .loginbox {
            max-width: 480px;
            width: 100%;
            padding: 40px;
            background-color: white;
            border-radius: var(--border-radius-lg);
            box-shadow: var(--card-shadow);
        }
        
        .img-logo {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 30px;
        }
        
        .img-logo img {
            max-height: 45px;
        }
        
        .back-home a {
            color: var(--primary-color);
            text-decoration: none;
            font-weight: 500;
            transition: all 0.3s ease;
        }
        
        .back-home a:hover {
            color: var(--primary-dark);
        }
        
        h1 {
            font-size: 26px;
            font-weight: 600;
            margin-bottom: 30px;
            color: var(--dark-color);
        }
        
        .input-block {
            margin-bottom: 20px;
        }
        
        .form-control-label {
            font-weight: 500;
            margin-bottom: 8px;
            display: block;
            color: var(--dark-color);
        }
        
        .form-control {
            height: 50px;
            padding: 10px 20px;
            border-radius: var(--border-radius);
            border: 1px solid #e5e5e5;
            transition: all 0.3s ease;
        }
        
        .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.2rem rgba(58, 97, 134, 0.25);
        }
        
        .pass-group {
            position: relative;
        }
        
        .toggle-password {
            position: absolute;
            right: 15px;
            top: 15px;
            cursor: pointer;
            color: #888;
        }
        
        .forgot {
            text-align: right;
            margin-bottom: 20px;
        }
        
        .forgot-link {
            color: var(--primary-color);
            text-decoration: none;
            font-weight: 500;
            transition: all 0.3s ease;
        }
        
        .forgot-link:hover {
            color: var(--primary-dark);
            text-decoration: underline;
        }
        
        .custom_check {
            position: relative;
            padding-left: 30px;
            cursor: pointer;
            display: inline-block;
            color: var(--secondary-color);
        }
        
        .custom_check input {
            position: absolute;
            opacity: 0;
            cursor: pointer;
        }
        
        .checkmark {
            position: absolute;
            top: 0;
            left: 0;
            height: 20px;
            width: 20px;
            border: 1px solid #ddd;
            border-radius: 3px;
        }
        
        .custom_check:hover input ~ .checkmark {
            border-color: var(--primary-color);
        }
        
        .custom_check input:checked ~ .checkmark {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
        }
        
        .checkmark:after {
            content: "";
            position: absolute;
            display: none;
        }
        
        .custom_check input:checked ~ .checkmark:after {
            display: block;
        }
        
        .custom_check .checkmark:after {
            left: 7px;
            top: 3px;
            width: 6px;
            height: 10px;
            border: solid white;
            border-width: 0 2px 2px 0;
            transform: rotate(45deg);
        }
        
        .btn-primary {
            background: var(--gradient-primary);
            border: none;
            height: 50px;
            font-weight: 500;
            border-radius: var(--border-radius);
            transition: all 0.3s ease;
        }
        
        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: var(--box-shadow);
        }
        
        .google-bg {
            margin-top: 40px;
            text-align: center;
        }
        
        .google-bg span {
            display: inline-block;
            position: relative;
            margin-bottom: 20px;
            color: var(--secondary-color);
        }
        
        .google-bg span:before,
        .google-bg span:after {
            content: '';
            position: absolute;
            top: 50%;
            width: 100px;
            height: 1px;
            background-color: #e5e5e5;
        }
        
        .google-bg span:before {
            right: 100%;
            margin-right: 15px;
        }
        
        .google-bg span:after {
            left: 100%;
            margin-left: 15px;
        }
        
        .sign-google ul {
            padding: 0;
            margin: 0 0 20px;
            list-style: none;
            display: flex;
            justify-content: center;
            gap: 15px;
        }
        
        .sign-google ul li a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            border: 1px solid #e5e5e5;
            transition: all 0.3s ease;
        }
        
        .sign-google ul li a:hover {
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        
        .sign-google img {
            max-width: 25px;
            max-height: 25px;
        }
        
        /* Animation elements */
        .login-banner {
            position: relative;
            z-index: 2;
            animation: floatAnimation 3s ease-in-out infinite;
        }
        
        @keyframes floatAnimation {
            0% { transform: translateY(0); }
            50% { transform: translateY(-20px); }
            100% { transform: translateY(0); }
        }
        
        /* Particles */
        .particles-container {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: 1;
            overflow: hidden;
        }
        
        .particle {
            position: absolute;
            background-color: rgba(255, 255, 255, 0.5);
            border-radius: 50%;
            pointer-events: none;
        }
        
        /* Responsiveness */
        @media (max-width: 991px) {
            .login-bg {
                height: auto;
                min-height: 400px;
            }
            
            .welcome-login {
                height: auto;
                min-height: 400px;
            }
            
            .login-wrap-bg {
                height: auto;
                padding: 40px 20px;
            }
            
            .loginbox {
                padding: 30px 20px;
            }
            
            .mentor-course h2 {
                font-size: 28px;
            }
        }
        
        @media (max-width: 767px) {
            .login-bg {
                min-height: 300px;
            }
            
            .welcome-login {
                min-height: 300px;
                padding: 20px;
            }
            
            .mentor-course h2 {
                font-size: 24px;
            }
            
            .mentor-course p {
                font-size: 14px;
            }
            
            .loginbox {
                padding: 25px 15px;
            }
        }