* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .container {
            background: white;
            border-radius: 15px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
            overflow: hidden;
            width: 100%;
            max-width: 400px;
            margin: 20px;
        }
        
        .header {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 30px 20px;
            text-align: center;
        }
        
        .header h1 {
            font-size: 24px;
            margin-bottom: 5px;
        }
        
        .header p {
            opacity: 0.9;
            font-size: 14px;
        }
        
        .content {
            padding: 30px;
        }
        
        .tab-buttons {
            display: flex;
            margin-bottom: 25px;
            background: #f5f5f5;
            border-radius: 8px;
            padding: 5px;
        }
        
        .tab-button {
            flex: 1;
            padding: 12px;
            border: none;
            background: transparent;
            cursor: pointer;
            border-radius: 6px;
            font-weight: 500;
            transition: all 0.3s ease;
        }
        
        .tab-button.active {
            background: white;
            box-shadow: 0 2px 8px rgba(0,0,0,0.1);
            color: #667eea;
        }
        
        .form-group {
            margin-bottom: 20px;
        }
        
        .form-group label {
            display: block;
            margin-bottom: 8px;
            color: #333;
            font-weight: 500;
        }
        
        .form-group input {
            width: 100%;
            padding: 12px 15px;
            border: 2px solid #e0e0e0;
            border-radius: 8px;
            font-size: 16px;
            transition: border-color 0.3s ease;
        }
        
        .form-group input:focus {
            outline: none;
            border-color: #667eea;
        }
        
        .submit-button {
            width: 100%;
            padding: 15px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border: none;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: transform 0.2s ease;
        }
        
        .submit-button:hover {
            transform: translateY(-2px);
        }
        
        .error-message {
            background: #fee;
            color: #c33;
            padding: 12px 15px;
            border-radius: 8px;
            margin-bottom: 20px;
            border-left: 4px solid #c33;
        }
        
        .form-section {
            display: none;
        }
        
        .form-section.active {
            display: block;
        }