body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            margin: 0;
            padding: 0;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .auth-container {
            background: white;
            border-radius: 12px;
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
            padding: 40px;
            width: 100%;
            max-width: 400px;
            margin: 20px;
        }

        .logo {
            text-align: center;
            margin-bottom: 30px;
        }

        .logo h1 {
            color: #333;
            margin: 0;
            font-size: 2.5em;
            font-weight: 300;
        }

        .logo p {
            color: #666;
            margin: 5px 0 0 0;
            font-size: 0.9em;
        }

        .btn-primary {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
        }

        .btn-primary:disabled {
            transform: none;
        }

        .error-message {
            background: #fee;
            color: #c33;
            padding: 10px;
            border-radius: 5px;
            margin-bottom: 20px;
            font-size: 14px;
            display: none;
        }

        .error-message.show {
            display: block;
        }

        .success-message {
            background: #d4edda;
            color: #155724;
            padding: 10px;
            border-radius: 5px;
            margin-bottom: 20px;
            font-size: 14px;
            display: none;
        }

        .success-message.show {
            display: block;
        }