:root {
            --main-bg-color: #f5f7f9;
            --header-bg-color: #2c3e50;
            --card-bg-color: #ffffff;
            --primary-color: #3498db;
            --secondary-color: #e74c3c;
            --text-color: #333;
            --border-color: #ddd;
            --shadow: 0 6px 15px rgba(0,0,0,0.1);
        }
        
        body {
            background-color: var(--main-bg-color);
            color: var(--text-color);
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            min-height: 100vh;
            display: flex;
            align-items: center; 
            justify-content: center;
            padding: 20px;
        }
        
        .auth-container {
            width: 100%;
            max-width: 420px;
 
        }
        
        .auth-card {
            background-color: var(--card-bg-color);
            border-radius: 12px;
            box-shadow: var(--shadow);
            overflow: hidden;
        }
        
        .auth-header {
            background-color: var(--header-bg-color);
            color: white;
            padding: 25px;
            text-align: center;
        }
        
        .auth-logo {
            font-size: 2.5rem;
            margin-bottom: 15px;
        }
        
        .auth-body {
            padding: 25px;
        }
        
        .form-control {
            padding: 12px 15px;
            border-radius: 6px;
            border: 1px solid var(--border-color);
            margin-bottom: 18px;
            transition: all 0.3s;
        }
        
        .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
        }
        
        .btn-auth {
            background-color: var(--primary-color);
            border: none;
            color: white;
            padding: 12px;
            border-radius: 6px;
            font-weight: 600;
            width: 100%;
            transition: all 0.3s;
        }
        
        .btn-auth:hover {
            background-color: #2980b9;
            transform: translateY(-2px);
        }
        
        .auth-footer {
            text-align: center;
            padding: 20px;
            background-color: rgba(0, 0, 0, 0.03);
            border-top: 1px solid var(--border-color);
        }
        
        .auth-switch {
            color: var(--primary-color);
            cursor: pointer;
            font-weight: 600;
        }
        
        .auth-switch:hover {
            text-decoration: underline;
        }
        
        .divider {
            display: flex;
            align-items: center;
            margin: 20px 0;
        }
        
        .divider::before,
        .divider::after {
            content: "";
            flex: 1;
            border-bottom: 1px solid var(--border-color);
        }
        
        .divider span {
            padding: 0 15px;
            color: #777;
            font-size: 14px;
        }
        
        .social-btn {
            display: block;
            text-align: center;
            padding: 10px;
            border-radius: 6px;
            margin-bottom: 10px;
            font-weight: 500;
            transition: all 0.3s;
        }
        
        .social-btn.google {
            background-color: #DB4437;
            color: white;
        }
        
        .social-btn.facebook {
            background-color: #4267B2;
            color: white;
        }
        
        .social-btn:hover {
            opacity: 0.9;
            transform: translateY(-2px);
        }