:root {
            --primary-color: #3498db;
            --primary-dark: #2980b9;
            --success-color: #2ecc71;
            --danger-color: #e74c3c;
            --gray-light: #f5f5f5;
            --gray-medium: #e0e0e0;
            --gray-dark: #7f8c8d;
            --text-color: #333;
            --white: #ffffff;
            --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        body {
            background-color: var(--gray-light);
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            padding: 20px;
        }
        
        .container {
            width: 100%;
            max-width: 450px;
        }
        
        .card {
            background-color: var(--white);
            border-radius: 10px;
            box-shadow: var(--shadow);
            padding: 30px;
            text-align: center;
        }
        
        .logo {
            margin-bottom: 20px;
        }
        
        .logo h1 {
            color: var(--primary-color);
            font-size: 28px;
            font-weight: 600;
        }
        
        h2 {
            color: var(--text-color);
            margin-bottom: 10px;
            font-weight: 500;
        }
        
        .subtitle {
            color: var(--gray-dark);
            margin-bottom: 25px;
            line-height: 1.5;
        }
        
        .form-group {
            margin-bottom: 20px;
            text-align: left;
        }
        
        label {
            display: block;
            margin-bottom: 8px;
            color: var(--text-color);
            font-weight: 500;
        }
        
        input[type="email"] {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid var(--gray-medium);
            border-radius: 5px;
            font-size: 16px;
            transition: border-color 0.3s;
        }
        
        input[type="email"]:focus {
            border-color: var(--primary-color);
            outline: none;
        }
        
        .btn {
            display: inline-block;
            width: 100%;
            padding: 12px;
            background-color: var(--primary-color);
            color: var(--white);
            border: none;
            border-radius: 5px;
            font-size: 16px;
            font-weight: 500;
            cursor: pointer;
            transition: background-color 0.3s;
        }
        
        .btn:hover {
            background-color: var(--primary-dark);
        }
        
        .btn:disabled {
            background-color: var(--gray-medium);
            cursor: not-allowed;
        }
        
        .message {
            padding: 12px;
            border-radius: 5px;
            margin-bottom: 20px;
            text-align: left;
        }
        
        .message.success {
            background-color: rgba(46, 204, 113, 0.1);
            border-left: 4px solid var(--success-color);
            color: var(--success-color);
        }
        
        .message.error {
            background-color: rgba(231, 76, 60, 0.1);
            border-left: 4px solid var(--danger-color);
            color: var(--danger-color);
        }
        
        .back-to-login {
            margin-top: 20px;
            color: var(--gray-dark);
        }
        
        .back-to-login a {
            color: var(--primary-color);
            text-decoration: none;
        }
        
        .back-to-login a:hover {
            text-decoration: underline;
        }
        
        .loading {
            display: none;
            text-align: center;
            margin-bottom: 15px;
        }
        
        .spinner {
            border: 4px solid rgba(0, 0, 0, 0.1);
            border-left-color: var(--primary-color);
            border-radius: 50%;
            width: 30px;
            height: 30px;
            animation: spin 1s linear infinite;
            margin: 0 auto;
        }
        
        @keyframes spin {
            to { transform: rotate(360deg); }
        }
        
        .security-notice {
            background-color: rgba(52, 152, 219, 0.1);
            border-radius: 5px;
            padding: 15px;
            margin-top: 25px;
            text-align: left;
            font-size: 14px;
            color: var(--gray-dark);
        }
        
        .security-notice h3 {
            color: var(--primary-color);
            margin-bottom: 8px;
            font-size: 16px;
        }
        
        @media (max-width: 480px) {
            .card {
                padding: 20px;
            }
        }