:root {
            --primary-color: #4361ee;
            --secondary-color: #3f37c9;
            --accent-color: #4895ef;
            --light-color: #f8f9fa;
            --dark-color: #212529;
            --gradient-start: #3a0ca3;
            --gradient-end: #7209b7;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            height: 100vh;
            display: flex;
            align-items: center;
            background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
            background-attachment: fixed;
            margin: 0;
            padding: 20px;
            transition: all 0.5s ease;
        }
        
        .auth-container {
            max-width: 450px;
            width: 100%;
            margin: 0 auto;
            background: white;
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
            overflow: hidden;
            animation: fadeInUp 0.5s ease;
        }
        
        @keyframes fadeInUp {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .auth-header {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            padding: 2rem;
            text-align: center;
        }
        
        .auth-header h1 {
            font-weight: 600;
            margin-bottom: 0.5rem;
            font-size: 1.8rem;
        }
        
        .auth-header p {
            opacity: 0.9;
            font-size: 0.9rem;
        }
        
        .auth-body {
            padding: 2rem;
        }
        
        .form-control {
            height: 50px;
            border-radius: 8px;
            border: 1px solid #e0e0e0;
            padding-left: 15px;
            margin-bottom: 1.2rem;
            transition: all 0.3s;
        }
        
        .form-control:focus {
            border-color: var(--accent-color);
            box-shadow: 0 0 0 0.25rem rgba(72, 149, 239, 0.25);
        }
        
        .btn-primary {
            background-color: var(--primary-color);
            border: none;
            color: white;
            height: 50px;
            border-radius: 8px;
            font-weight: 600;
            width: 100%;
            margin-top: 0.5rem;
            transition: all 0.3s;
        }
        
        .btn-primary:hover {
            background-color: var(--secondary-color);
            transform: translateY(-2px);
        }
        
        .auth-footer {
            text-align: center;
            padding: 1rem 2rem 2rem;
            color: #666;
            font-size: 0.9rem;
        }
        
        .auth-footer a {
            color: var(--primary-color);
            text-decoration: none;
            font-weight: 500;
        }
        
        .auth-footer a:hover {
            text-decoration: underline;
        }
        
        .divider {
            display: flex;
            align-items: center;
            margin: 1.5rem 0;
            color: #999;
        }
        
        .divider::before, .divider::after {
            content: "";
            flex: 1;
            border-bottom: 1px solid #eee;
        }
        
        .divider::before {
            margin-right: 1rem;
        }
        
        .divider::after {
            margin-left: 1rem;
        }
        
        .btn-outline-primary {
            display: block;
            width: 100%;
            padding: 12px;
            background-color: white;
            border: 1px solid var(--primary-color);
            color: var(--primary-color);
            border-radius: 8px;
            font-weight: 600;
            text-align: center;
            transition: all 0.3s;
        }
        
        .btn-outline-primary:hover {
            background-color: #f0f4ff;
            border-color: var(--secondary-color);
            color: var(--secondary-color);
        }
        
        .input-group-text {
            background-color: transparent;
            border-right: none;
        }
        
        .input-with-icon {
            border-left: none;
            padding-left: 5px;
        }
        
        .error-message {
            animation: fadeIn 0.3s ease-in-out;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(-10px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .page-transition {
            animation: fadeIn 0.5s ease;
        }
        
        /* Loading animation for form submission */
        .btn-loading {
            position: relative;
            pointer-events: none;
        }
        
        .btn-loading::after {
            content: "";
            position: absolute;
            width: 16px;
            height: 16px;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            margin: auto;
            border: 4px solid transparent;
            border-top-color: #ffffff;
            border-radius: 50%;
            animation: button-loading-spinner 1s ease infinite;
        }
        
        @keyframes button-loading-spinner {
            from { transform: rotate(0turn); }
            to { transform: rotate(1turn); }
        }