body { font-family: Arial, sans-serif; background: #f5f5f5; display: flex; justify-content: center; align-items: center; min-height: 100vh; margin: 0; padding: 20px; box-sizing: border-box; }
        .login-box { background: white; padding: 40px; border-radius: 10px; box-shadow: 0 4px 6px rgba(0,0,0,0.1); width: 100%; max-width: 400px; }
        .header { text-align: center; margin-bottom: 30px; color: #09B1BA; }
        .tabs { display: flex; margin-bottom: 20px; }
        .tab { flex: 1; padding: 12px; text-align: center; background: #f8f9fa; border: 1px solid #ddd; cursor: pointer; transition: all 0.3s; }
        .tab:first-child { border-top-left-radius: 5px; border-bottom-left-radius: 5px; }
        .tab:last-child { border-top-right-radius: 5px; border-bottom-right-radius: 5px; border-left: none; }
        .tab.active { background: #09B1BA; color: white; }
        .tab:hover:not(.active) { background: #e9ecef; }
        .form-container { display: none; }
        .form-container.active { display: block; }
        .form-group { margin: 20px 0; }
        label { display: block; margin-bottom: 5px; font-weight: bold; }
        input[type="text"], input[type="password"] { width: 100%; padding: 12px; border: 1px solid #ddd; border-radius: 5px; box-sizing: border-box; }
        button { width: 100%; background: #09B1BA; color: white; padding: 12px; border: none; border-radius: 5px; cursor: pointer; font-size: 16px; }
        button:hover { background: #0891A6; }
        .error { color: #f44336; text-align: center; margin-top: 15px; padding: 10px; background: #ffebee; border-radius: 5px; }
        .success { color: #4CAF50; text-align: center; margin-top: 15px; padding: 10px; background: #e8f5e8; border-radius: 5px; }
        .info { color: #666; font-size: 12px; margin-top: 10px; text-align: center; }